HOLY CRAP...look what fixed several problems
06-11-2007, 05:44 PM
#21
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Originally Posted by Black02SS
FYI P1133 is normally a bad oxygen sensor.
Where's that sensor located? Or do you mean an O2 sensor for the exhaust? Both of mine are 3 months old.
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06-12-2007, 01:17 PM
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Originally Posted by MeentSS02
Go to the driver's side header, and find the farthest forward sensor...it should be in the collector (where the 4 pipes merge into one).
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06-12-2007, 06:07 PM
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One issue with running a "faulty" MAF is severe lean spikes. I tuned an '00 SS LS1 last week that had a "severe stumble" as the owner called it when he stood on the throttle. I ran the car to about 4400RPM when I saw the WB/02 spike to 16:1 and shut it down. I loaded the dyno and eased my way up to the RPM range and sure enough again it climbed. I disconnected the MAF and setup for SD after confirming the fuel pressure was fine. The car immediately responded and the lean spike went away.
Moral of the story...do not assume the PCM will default to SD mode because the MAF is not reading properly. There were no SES lights or trouble codes. With a new MAF installed after the tune and even with the stock tune replaced to verify...it ran perfectly.
-Kenny
Moral of the story...do not assume the PCM will default to SD mode because the MAF is not reading properly. There were no SES lights or trouble codes. With a new MAF installed after the tune and even with the stock tune replaced to verify...it ran perfectly.
-Kenny
06-12-2007, 06:59 PM
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Originally Posted by MeentSS02
Not bad for narrow band O2 sensors living in headers...that's why I threw mine away a couple years ago 
The new ones I put in 3 months ago are still fine. My second set of O2's in 9 years.
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06-12-2007, 08:57 PM
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Later model year autos may not shift hard when in SD mode. In fact, this may just be the behavior of 1997-98s but I'm not 100% positive of this. When they fall into SD mode, the trans line pressures get jacked way up too. This can be corrected with HPT. 