Ok, good answer, now if the knock sensor is disconnected, but continues to do the same thing, retard timing instead of advanceing timing. I have tried this, dsconnecting the knock sensor module from the ecm, same results. What could I have wired wrong that would do this??? I did add a 2 bar map sensor and harness.
I had to do something wrong, many others are running just fine.
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05:15 PM
AutoTech Member
Posts: 2385 From: St. Charles, Illinois Registered: Aug 2004
Wait a second. Is the timing being retared, or pulled out all together? I think I may have mis-read your question. Timing retard is normal under boost.
[This message has been edited by AutoTech (edited 01-28-2008).]
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10:59 AM
darkhorizon Member
Posts: 12279 From: Flint Michigan Registered: Jan 2006
Not sure the amount of time that is being pulled out, do not have the scans here at work. But it is pulling so much timing out that it will hardly eccelerate at all. I mean, from a dead stop I have to barely push the gas pedal at all or it will just boog and not eccelerate at all.
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01:12 PM
Dan010 Member
Posts: 776 From: Katy, Texas USA Registered: Oct 2001
is it possible to wire the map sensor wrong and still have the ecm not throw a code The turbo the map sensor, knock sensor were added. Have 2 chips, 1 with knock sensor disabled, 1 enabled, no difference in how the engin runs
I am looking for any possible reason for the timing to be pulled so far that it will not work.
OK, I am working with Ryan at Sinster performance. Ryan has review the scans that I have done 2 times. Also, reviewed a scan of the chip that came with the turbo setup that I purchased. Ryan has reviewed and indicated that the scans are showing this pull out of timing. Ryan is/has tried looking at this, he is doing an excellent job trying to evaluate what is happening.
This is why I am asking here what can make this happen, what might i have done wrong. I am at a point I might just take the turbo off and enjoy My Fiero with out a turbo.
OK, I am working with Ryan at Sinster performance. Ryan has review the scans that I have done 2 times. Also, reviewed a scan of the chip that came with the turbo setup that I purchased. Ryan has reviewed and indicated that the scans are showing this pull out of timing. Ryan is/has tried looking at this, he is doing an excellent job trying to evaluate what is happening.
This is why I am asking here what can make this happen, what might i have done wrong. I am at a point I might just take the turbo off and enjoy My Fiero with out a turbo.
The turbo very likely has nothing at all to do with what's happening, it's just a minor exhaust restriction. I would focus on the chip and the wiring. In situations like this it is important to go over all changes made after the engine last ran properly. Not knowing what changes you made and the time you made them makes it difficult but based on your description I would suspect a wire is improperly connected like putting a battery in an electric car with the terminals connected backwards. If you just installed the ESC module you should go over the wiring again and make sure the power supply is connected properly. Although it's solid state equipment it's pretty old technology and there may be a possibility connecting it backwards will make it function in reverse as opposed to ruining it. I would also look at the ignition module because they can do some weird things in addition to failing all together when they are bad. My first experience with a bad one resulted in the engine (2.8) idling like I was still sitting at a light although the accelerator was at half throttle.
You should review your TPS voltage also and any sensor or wire tampered with just before the problem started. It's possible you have a bad electronic part that may not be detectable through the datalog. I would certainly be suspicious of the ESC module also.
Yes the MAP can fail without setting a code, that's why my swap hasn't been test driven yet.
[This message has been edited by Joseph Upson (edited 01-28-2008).]
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05:20 PM
Jan 29th, 2008
Dan010 Member
Posts: 776 From: Katy, Texas USA Registered: Oct 2001