bad iac/tps???

[nakgtp]

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

[Austins01GP]

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

[nakgtp]

nevermind. i found it. not exactly a pro at this yet but hell, if i keeps breaking i will be.

[nakgtp]

does the gtp have a map sensor? i thought the maf replaced that?

[GTPSHAWTY]

so that fixed it?

[nakgtp]

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

[Austins01GP]

hard to tell i guess unplug the maf and see if it starts up no problem.. maybe we will figure somethin out

[nakgtp]

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

[GTPSHAWTY]

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

[FordMan77]

You check the vac T under the S/C snout? And yes, the IAC could cause this.

[nakgtp]

maf unplugged.. runs for maybe 3 seconds tops... shuts off smooth. can repeat this until battery dies if i wanted to.

[GTPSHAWTY]

yes mine is on and snug .. all the lines coming from and to it is also nice and snug

[FordMan77]

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.

[nakgtp]

appreciate all the suggestions... will try them out and post results later

[nakgtp]

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

[nakgtp]

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

[FordMan77]

No CEL? I'm wondering if you got a bad MAF (it happens).

[nakgtp]

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

[nakgtp]

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

[footballplaya3k]

Any codes? I had similar idle issues with a bad bank 1 O2