might have swapped map sensor with cam sensor..please help!
might have swapped map sensor with cam sensor..please help! Hi everyone. Just got our ls7 441 back for our 99 Camaro and has a new speed density tune. Previously it had a Maf.
We sent it out to get fixed because it had a cracked head. Started right up before but after maybe 30 seconds it would idle around 2000 rpm
We have a casper cam and knock sensor extension and the map connector and cam sensor connector are right next to each other. We hooked them up the opposite this time, because we thought last time we hooked them up wrong and figured that's why it idled high.
Skipping ahead that was about 3 months ago with the high idle.....went to start it today after getting it all back together and it just turns over and pops. Sounds like fireworks coming out of the headers. Seems about every other time it starts then dies within 2 or 3 seconds and won't take any throttle.
So does anyone by chance know how it would run if we had the cam sensor connected to the map and vice versa?
That's the only thing different we did this time and the speed density tune. Any ideas?? Thanks!
We sent it out to get fixed because it had a cracked head. Started right up before but after maybe 30 seconds it would idle around 2000 rpm
We have a casper cam and knock sensor extension and the map connector and cam sensor connector are right next to each other. We hooked them up the opposite this time, because we thought last time we hooked them up wrong and figured that's why it idled high.
Skipping ahead that was about 3 months ago with the high idle.....went to start it today after getting it all back together and it just turns over and pops. Sounds like fireworks coming out of the headers. Seems about every other time it starts then dies within 2 or 3 seconds and won't take any throttle.
So does anyone by chance know how it would run if we had the cam sensor connected to the map and vice versa?
That's the only thing different we did this time and the speed density tune. Any ideas?? Thanks!
Last edited by jenfred10; Sep 2, 2015 at 09:01 PM.
Switched them out and still doesn't run right. Getting a code for the Maf
Will only idle once in a while ( not for long )and breaks up until 2,500 RPM or above. Do you guys think it's tune related?
Will only idle once in a while ( not for long )and breaks up until 2,500 RPM or above. Do you guys think it's tune related?
It will start, it just won't idle. The only way we got it to idle is my brother in law blocked half the flow with his hand and it idled decent at around 1,400 rpm.
It wouldn't take the throttle well then, it would hesitate first.
I really hope it's not a bad maf. We bought it brand new last year and it has about 20 minutes of use. It almost seems like we had the same code then too.
We had a mail order tune at the time and it ran better with a cracked head but idled really high.
It wouldn't take the throttle well then, it would hesitate first.
I really hope it's not a bad maf. We bought it brand new last year and it has about 20 minutes of use. It almost seems like we had the same code then too.
We had a mail order tune at the time and it ran better with a cracked head but idled really high.
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Hi everyone. Just got our ls7 441 back for our 99 Camaro and has a new speed density tune. Previously it had a Maf.
We sent it out to get fixed because it had a cracked head. Started right up before but after maybe 30 seconds it would idle around 2000 rpm
We have a casper cam and knock sensor extension and the map connector and cam sensor connector are right next to each other. We hooked them up the opposite this time, because we thought last time we hooked them up wrong and figured that's why it idled high.
Skipping ahead that was about 3 months ago with the high idle.....went to start it today after getting it all back together and it just turns over and pops. Sounds like fireworks coming out of the headers. Seems about every other time it starts then dies within 2 or 3 seconds and won't take any throttle.
So does anyone by chance know how it would run if we had the cam sensor connected to the map and vice versa?
Any ideas?? Thanks!
We sent it out to get fixed because it had a cracked head. Started right up before but after maybe 30 seconds it would idle around 2000 rpm
We have a casper cam and knock sensor extension and the map connector and cam sensor connector are right next to each other. We hooked them up the opposite this time, because we thought last time we hooked them up wrong and figured that's why it idled high.
Skipping ahead that was about 3 months ago with the high idle.....went to start it today after getting it all back together and it just turns over and pops. Sounds like fireworks coming out of the headers. Seems about every other time it starts then dies within 2 or 3 seconds and won't take any throttle.
So does anyone by chance know how it would run if we had the cam sensor connected to the map and vice versa?
Any ideas?? Thanks!
first line says "Hi everyone. Just got our ls7 441 back for our 99 Camaro and has a new speed density tune. Previously it had a Maf."
last line says "That's the only thing different we did this time and the speed density tune."
And your last post says "I really hope it's not the Maf. We bought it brand new last year and it has about 20 minutes of use."
What did I miss? I am by no means a tuner but is there a problem with that
somehow? Or was it just a case of mistyping
map sensor and cam sensor First check voltage you map sensor should have no more than 5 volts. Next, is your front cover where the cam sensor plugs into aftermarket or a gm piece. There was some confusion in the pin out on some of the front covers made in the aftermarket. To answer your question, no the motor will not run with the sensors crossed. Make sure the MAP is getting 5 and the cam is getting 12 or more. If that doesn't correct the problem the next step is to check pin out on the cam sensor? What ETC are you receiving.
first line says "Hi everyone. Just got our ls7 441 back for our 99 Camaro and has a new speed density tune. Previously it had a Maf."
last line says "That's the only thing different we did this time and the speed density tune."
And your last post says "I really hope it's not the Maf. We bought it brand new last year and it has about 20 minutes of use."
What did I miss? I am by no means a tuner but is there a problem with that
somehow? Or was it just a case of mistyping
last line says "That's the only thing different we did this time and the speed density tune."
And your last post says "I really hope it's not the Maf. We bought it brand new last year and it has about 20 minutes of use."
What did I miss? I am by no means a tuner but is there a problem with that
somehow? Or was it just a case of mistyping
Last year we got the new motor in and just got a temporary mail order tune and was using the the tsp 100mm maf.
We only got about 20 min. Run time before we noticed a ton of coolant in the oil and that was it for it.
Skipping ahead... my husband pulled the motor out this spring and sent the motor out to get fixed and tuned out of state. We had a cracked head ( casting defect) so that was replaced, the motor disassembled, inspected and cleaned and was broken in on an engine dyno. Made 655hp, and he did a speed density tune.
So other than the tune The only thing we did different was swapped the connectors but switched them back. Since we got the Maf code we put the maf back on and it ran better. Not good, but better.
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First check voltage you map sensor should have no more than 5 volts. Next, is your front cover where the cam sensor plugs into aftermarket or a gm piece. There was some confusion in the pin out on some of the front covers made in the aftermarket. To answer your question, no the motor will not run with the sensors crossed. Make sure the MAP is getting 5 and the cam is getting 12 or more. If that doesn't correct the problem the next step is to check pin out on the cam sensor? What ETC are you receiving.
Ran a couple more times and smells strongly like gas and backfires and wants to stall and lower rpms. Seems to clear out if revved a bit. Did get an 02 code once(brand new sensors) and have sooty collectors.
I guess our big thing is we are struggling to come up with the money for the tune and am hoping that's all it is before we pay to get the car flatbeded an hour away to new era performance. We are planning in another week to have it done after my husband gets the tsp duals on.
Would you guess it's more tune related?
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Joined: Jun 2015
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You shouldn't be using your MAF for fueling if you're open loop speed density tuning. That's probably why you're having problems - the ECU is confused. Speed density (open loop) focuses on your MAP sensor to estimate fueling, not your MAF. You need to use whatever software you're using to inhibit your MAF and those relative codes.
It turns out it was a bad vss vehicle speed sensor.
Had that code for a while now and didn't realize it would affect the way it ran.
It still needs a tune, but is much better and drivable now.
We are going to Wait until spring to get it retuned as we used that money to put the car on the road.
Had that code for a while now and didn't realize it would affect the way it ran.
It still needs a tune, but is much better and drivable now.
We are going to Wait until spring to get it retuned as we used that money to put the car on the road.
You shouldn't be using your MAF for fueling if you're open loop speed density tuning. That's probably why you're having problems - the ECU is confused. Speed density (open loop) focuses on your MAP sensor to estimate fueling, not your MAF. You need to use whatever software you're using to inhibit your MAF and those relative codes.
It now has about 100 miles on it. We are about to put it away for the winter this week though.
Was just about to get a hold of you to see if you got yours out this year.
Nice times! Did you get it on video again?
