• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

bad iac/tps???

N

nakgtp

New member
What are some of the signs of a bad iac or tps. Are they in anyway related to the mass airflow sensor? 2000 gtp will start and die as soon as it tries to settle into idle. Brand new just installed maf and fuel pump resistor installed within the last 6 months, as well as new fuel filter. Running out of ideas as to what the problem is as this is a reaccuring problem. Any ideas?? i would appreciate any help
 


my buddys car did this and thought the same thing, turned out to be a large vacuum leak going into the map sensor.. so i say start by looking for a big vacuum leak
 
i wish. can find any leaks. but the issue has been if i leave it for long enough it will run and i can keep it running with a little throttle play
 


i have the same problem.. i unplugged maf nothin changed.. i changed maf nothin changed.. i cleaned tb nothin changed.. i change th vac hose from the tb to the map nothin changed... next
 
maf unplugged.. runs for maybe 3 seconds tops... shuts off smooth. can repeat this until battery dies if i wanted to.
 


checked vac under sc... no leaks.. also what is the best way to check for leaks? i have been using propane or carb cleaner.. really hard to hear anything due to the cold air
 
I use brake or carb cleaner too, so not sure what else there is. And with the MAF unplugged you will have to feather the throttle a bit before it will run on its own. Once the ECU figures out its not getting MAF input it will adjust. Just don't drive it this way too much and don't get into boost for sure.

Have you checked your fuel pressure? Maybe check the FPR. Pull the line off the FPR while it's not running and see if gas comes out of it. If so, then replace it.
 
still no progress. noticed exhaust smells very rich...way more so than usual. kept engine running by light application of throttle but dies immediately upon release. smooth engine shut off as if i turned the key off
 
replaced iac.. was covered in carbon build up. looked like it had been torched. how is that possible? replaced and still same issue... increased run time b4 shut off by maybe 2 sec
 


bad fp resistor.. sick of hearing that? ha cars running fine after my trek to every local auto parts store and finally to the gm parts dealer... 65 bucks with one yr warranty... thanks for all the suggestions. still looking for a list of alternate mounting points for it since it seems to keep cracking in its current location on the driver side strut tower
 
bad fp resistor.. sick of hearing that? ha cars running fine after my trek to every local auto parts store and finally to the gm parts dealer... 65 bucks with one yr warranty... thanks for all the suggestions. still looking for a list of alternate mounting points for it since it seems to keep cracking in its current location on the driver side strut tower
 
You must log in or register to reply here.
Back
Top