Which sensor, when failing, causes backfiring and complete loss of power, then stall.
07-04-2020, 07:38 PM
#1
Which sensor, when failing, causes backfiring and complete loss of power, then stall. 1 week ago. Cruising at 45mph.....I gradually accelerate to speed up to 60mph...….
Complete loss of power....big backfire bangs out the exhaust pipes......gas pedal movement has no affect, but its still barely running and backfiring...….
Then it finally stalls......pull over to the side of the road thinking the engine literally came apart...….and it fires right up perfectly and runs normal like nothing ever happened...…
A couple times since then while accelerating gradually from a traffic light.....it backfired a little and stumbled......then picked right up and has been normal since.
No codes accept for a Bank 2 Sensor 1 Slow Response.....which is kind of normal for this PCM. Even after replacing a brand new 02 sensor that code pops up a week later and stays forever.
But can a bad/failing 02 sensor cause backfiring, loss of power, stalling out. Then its perfect for a week.
Thanks.
Complete loss of power....big backfire bangs out the exhaust pipes......gas pedal movement has no affect, but its still barely running and backfiring...….
Then it finally stalls......pull over to the side of the road thinking the engine literally came apart...….and it fires right up perfectly and runs normal like nothing ever happened...…
A couple times since then while accelerating gradually from a traffic light.....it backfired a little and stumbled......then picked right up and has been normal since.
No codes accept for a Bank 2 Sensor 1 Slow Response.....which is kind of normal for this PCM. Even after replacing a brand new 02 sensor that code pops up a week later and stays forever.
But can a bad/failing 02 sensor cause backfiring, loss of power, stalling out. Then its perfect for a week.
Thanks.
The following users liked this post:
G Atsma (07-04-2020)
07-04-2020, 09:03 PM
#3
Did you have any codes?
I bought my Trans Am new in 1998 and I’ve learned that a lot of these cars have PCMs that sometimes show “failing” sensors and I know a bunch of people like me with 98-02 Fbodys with PCMs that do not show codes for “failing” sensors......they only show a code when the sensor actually fails or is basically failed and causing major problems.
I bought all new engine sensors the other day, all AC Delco. I’ll put them all in, but I’ll start with the Crank Sensor.
Thanks.
07-10-2020, 04:09 AM
#4
I had a coolant temp sensor break when I did long tubes on my B4C and it caused a short, making the car run suuuuuuper rich, loss of power and also randomly die. Might be worth a look.
07-10-2020, 07:23 AM
#5
Thats why I’ve always said all PCMs are not created equal. They are different inside at least how the brain of it works.
i have a new Coolant Temp sensor too....if the Crank sensor doesn’t do the trick I’ll put that one in also. I’m changing sensors one at a time so I can find which I’ve is the culprit because my PCM doesn’t want to tell me.....lol
Thanks.
07-10-2020, 07:29 AM
#6
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07-10-2020, 09:49 AM
#9
From user JRP.. What's different about a B4C???
Got this question asked on another board and figured that because the question comes up with regularity, I'd post it here, too.......... (moderators...you may want to move this to other forums.......)
The question: How does a B4C differ from a Z28?
Since 1998, the only real parts difference, overall is the rear trailing arms.
The packaging is different. From 1998 thru 2000, the B4C came with a Power Steering Cooler, whereas the Z28 offered the cooler as an option....however, the cooler was made standard on all V8s in 2001/ 2002.....
From 1998 thru 2000, the B4C included Eagle RS-A Tires..which meant the car was not speed limited to 110 (or thereabouts) as a standard Z28 with the standard Eagle GA tires. (Z28s with RS-A tires or GSCs were speed limited to 162mph as I recall.)
From 1998 thru 2002, the B4C had power windows, locks, mirrors, and driver's seat in the package along with, I believe, fog lamps cruise control, and a power hatch release. (this forces a heavier wiring harness in the body of the car.......) The B4C also came with the vinyl steering wheel and brake release handle unless you specifically ordered the leather wrapped wheel ('98/'99) or the "Duplicate Radio Controls" (00, 01, 02) which got you the leather wrapped wheel and brake release. The B4C also deleted the Z28 emblems and furthermore forced a body colored roof panel, rather than the black roof panel that Z28s came with. CC1 removable roof panels were not available. The 6-speed transmission WAS available. However, from Start of Production in the '98 model year, thru the end of January 2002, the B4C could only be ordered 'Fleet' and that required a 6-digit fleet code to do so. Starting in February of 2002, the B4C was opened up (quietly) to retail orders for a good reason: We told (thru our fleet operations) all B4C users that fleet orders would not be accepted after February 1 due to build out and the large number of sold orders. Naturally, we started getting calls from dealers/police departments wanting to "order one more car......."
No larger battery, no larger alternator, no special transmission or engine or brakes......
oh....a few other things....I believe we made the Monsoon system standard on the Z28 in 1998. (memory is fading...it's late.....) The B4C, on the other hand, got the standard radio ...but could be upgraded to the Monsoon as a free flow option.... and remote keyless entry, while in the upgrade package on the Z28 was a free flow option on the B4C. AND......depending on the number of orders, we would two-tone cars with B4C....required, as I recall, a 90 day lead time and line drawings would have to be submitted.....and the colors had to be existing RPO colors........paint lines would be established by body panels. Most usually had doors and hood the secondary color with the rest of the panels the primary color. There was a charge for this, and thus, most departments desiring special paint would do it locally once they received the cars.
Got this question asked on another board and figured that because the question comes up with regularity, I'd post it here, too.......... (moderators...you may want to move this to other forums.......)
The question: How does a B4C differ from a Z28?
Since 1998, the only real parts difference, overall is the rear trailing arms.
The packaging is different. From 1998 thru 2000, the B4C came with a Power Steering Cooler, whereas the Z28 offered the cooler as an option....however, the cooler was made standard on all V8s in 2001/ 2002.....
From 1998 thru 2000, the B4C included Eagle RS-A Tires..which meant the car was not speed limited to 110 (or thereabouts) as a standard Z28 with the standard Eagle GA tires. (Z28s with RS-A tires or GSCs were speed limited to 162mph as I recall.)
From 1998 thru 2002, the B4C had power windows, locks, mirrors, and driver's seat in the package along with, I believe, fog lamps cruise control, and a power hatch release. (this forces a heavier wiring harness in the body of the car.......) The B4C also came with the vinyl steering wheel and brake release handle unless you specifically ordered the leather wrapped wheel ('98/'99) or the "Duplicate Radio Controls" (00, 01, 02) which got you the leather wrapped wheel and brake release. The B4C also deleted the Z28 emblems and furthermore forced a body colored roof panel, rather than the black roof panel that Z28s came with. CC1 removable roof panels were not available. The 6-speed transmission WAS available. However, from Start of Production in the '98 model year, thru the end of January 2002, the B4C could only be ordered 'Fleet' and that required a 6-digit fleet code to do so. Starting in February of 2002, the B4C was opened up (quietly) to retail orders for a good reason: We told (thru our fleet operations) all B4C users that fleet orders would not be accepted after February 1 due to build out and the large number of sold orders. Naturally, we started getting calls from dealers/police departments wanting to "order one more car......."
No larger battery, no larger alternator, no special transmission or engine or brakes......
oh....a few other things....I believe we made the Monsoon system standard on the Z28 in 1998. (memory is fading...it's late.....) The B4C, on the other hand, got the standard radio ...but could be upgraded to the Monsoon as a free flow option.... and remote keyless entry, while in the upgrade package on the Z28 was a free flow option on the B4C. AND......depending on the number of orders, we would two-tone cars with B4C....required, as I recall, a 90 day lead time and line drawings would have to be submitted.....and the colors had to be existing RPO colors........paint lines would be established by body panels. Most usually had doors and hood the secondary color with the rest of the panels the primary color. There was a charge for this, and thus, most departments desiring special paint would do it locally once they received the cars.
07-10-2020, 12:06 PM
#12
What's different about a B4C???
Got this question asked on another board and figured that because the question comes up with regularity, I'd post it here, too.......... (moderators...you may want to move this to other forums.......)
The question: How does a B4C differ from a Z28?
Since 1998, the only real parts difference, overall is the rear trailing arms.
The packaging is different. From 1998 thru 2000, the B4C came with a Power Steering Cooler, whereas the Z28 offered the cooler as an option....however, the cooler was made standard on all V8s in 2001/ 2002.....
From 1998 thru 2000, the B4C included Eagle RS-A Tires..which meant the car was not speed limited to 110 (or thereabouts) as a standard Z28 with the standard Eagle GA tires. (Z28s with RS-A tires or GSCs were speed limited to 162mph as I recall.)
From 1998 thru 2002, the B4C had power windows, locks, mirrors, and driver's seat in the package along with, I believe, fog lamps cruise control, and a power hatch release. (this forces a heavier wiring harness in the body of the car.......) The B4C also came with the vinyl steering wheel and brake release handle unless you specifically ordered the leather wrapped wheel ('98/'99) or the "Duplicate Radio Controls" (00, 01, 02) which got you the leather wrapped wheel and brake release. The B4C also deleted the Z28 emblems and furthermore forced a body colored roof panel, rather than the black roof panel that Z28s came with. CC1 removable roof panels were not available. The 6-speed transmission WAS available. However, from Start of Production in the '98 model year, thru the end of January 2002, the B4C could only be ordered 'Fleet' and that required a 6-digit fleet code to do so. Starting in February of 2002, the B4C was opened up (quietly) to retail orders for a good reason: We told (thru our fleet operations) all B4C users that fleet orders would not be accepted after February 1 due to build out and the large number of sold orders. Naturally, we started getting calls from dealers/police departments wanting to "order one more car......."
No larger battery, no larger alternator, no special transmission or engine or brakes......
oh....a few other things....I believe we made the Monsoon system standard on the Z28 in 1998. (memory is fading...it's late.....) The B4C, on the other hand, got the standard radio ...but could be upgraded to the Monsoon as a free flow option.... and remote keyless entry, while in the upgrade package on the Z28 was a free flow option on the B4C. AND......depending on the number of orders, we would two-tone cars with B4C....required, as I recall, a 90 day lead time and line drawings would have to be submitted.....and the colors had to be existing RPO colors........paint lines would be established by body panels. Most usually had doors and hood the secondary color with the rest of the panels the primary color. There was a charge for this, and thus, most departments desiring special paint would do it locally once they received the cars.
Got this question asked on another board and figured that because the question comes up with regularity, I'd post it here, too.......... (moderators...you may want to move this to other forums.......)
The question: How does a B4C differ from a Z28?
Since 1998, the only real parts difference, overall is the rear trailing arms.
The packaging is different. From 1998 thru 2000, the B4C came with a Power Steering Cooler, whereas the Z28 offered the cooler as an option....however, the cooler was made standard on all V8s in 2001/ 2002.....
From 1998 thru 2000, the B4C included Eagle RS-A Tires..which meant the car was not speed limited to 110 (or thereabouts) as a standard Z28 with the standard Eagle GA tires. (Z28s with RS-A tires or GSCs were speed limited to 162mph as I recall.)
From 1998 thru 2002, the B4C had power windows, locks, mirrors, and driver's seat in the package along with, I believe, fog lamps cruise control, and a power hatch release. (this forces a heavier wiring harness in the body of the car.......) The B4C also came with the vinyl steering wheel and brake release handle unless you specifically ordered the leather wrapped wheel ('98/'99) or the "Duplicate Radio Controls" (00, 01, 02) which got you the leather wrapped wheel and brake release. The B4C also deleted the Z28 emblems and furthermore forced a body colored roof panel, rather than the black roof panel that Z28s came with. CC1 removable roof panels were not available. The 6-speed transmission WAS available. However, from Start of Production in the '98 model year, thru the end of January 2002, the B4C could only be ordered 'Fleet' and that required a 6-digit fleet code to do so. Starting in February of 2002, the B4C was opened up (quietly) to retail orders for a good reason: We told (thru our fleet operations) all B4C users that fleet orders would not be accepted after February 1 due to build out and the large number of sold orders. Naturally, we started getting calls from dealers/police departments wanting to "order one more car......."
No larger battery, no larger alternator, no special transmission or engine or brakes......
oh....a few other things....I believe we made the Monsoon system standard on the Z28 in 1998. (memory is fading...it's late.....) The B4C, on the other hand, got the standard radio ...but could be upgraded to the Monsoon as a free flow option.... and remote keyless entry, while in the upgrade package on the Z28 was a free flow option on the B4C. AND......depending on the number of orders, we would two-tone cars with B4C....required, as I recall, a 90 day lead time and line drawings would have to be submitted.....and the colors had to be existing RPO colors........paint lines would be established by body panels. Most usually had doors and hood the secondary color with the rest of the panels the primary color. There was a charge for this, and thus, most departments desiring special paint would do it locally once they received the cars.
ok cool.....thanks.
07-10-2020, 12:08 PM
#13
I just got The Call.......I have to leave the country over to Asia tomorrow morning. Sucks......won’t be back for 3 months. Going out to cover my car and disconnect the battery now. I’ll do it all when I get back.
07-10-2020, 12:49 PM
#14
TECH Senior Member
07-11-2020, 10:23 PM
#15
So....I stayed one more day. Actually covered it this morning and drive it downstairs to where our building has a tire air service station. Just filing through my building it started losing rpm and backfiring. SES came on. So I read the code and sure enough it said something like: Crankshaft Position Sensor Low Performance
So cool....it’s that sensor. I’ll do it when I get back to the USA.
So cool....it’s that sensor. I’ll do it when I get back to the USA.
The following users liked this post:
LilJayV10 (07-12-2020)
07-11-2020, 10:24 PM
#16