hesitation and stalling. 94 gp 3100

[stockgp]

i've noticed the past 10 days or so i've got a worsening hesitation problem.

 

as the car warms up, it will hesitate pretty badly from a stop. rolling to a stop or going around a turn i have to slow way down for, it will want to stall. it's getting bad enough that i have to drive with two feet to keep it from stalling.

 

i've changed the tps already. it was throwing an ses code last week, but not now.

 

now, i did do a lim gasket job a couple weeks ago. i've been checking the oil and coolant regularly. no pudding in the valve cover. she does get a bit warm, but just a touch over 210. i think that's just air in the cooling system, though.

 

any thoughts?

[Robby1870]

The hesitation could be the IAC. I had one go out that way. It would still idle, not great by any means, but the conditions you described caused major hesitation. What was the code it was throwing? I know you said 94, so its not real easy to get the code, but maybe you went and got it scanned.

[stockgp]

i don't know what code it was. i usually don't get off work in time to make it to a dealer or mechanic to get it scanned.

[stockgp]

update:

 

installed a new tps and iac. that helped, until the first time i shut off my car and restarted it.

 

only other thing i can think of is a bad injector?

[GP1138]

Could be the coils and/or ICM. Get a set from the junkyard or just get one and put it in the place of each of your coilpacks in succession until the hesitation stops.

[stockgp]

yeah, yeah.

 

i've also noticed a bit of hesitation at pretty much any other rpm. if i let off the gas for a second, then get back in it, it hesitates.

 

sound like it could be ignition proglem?

[GP1138]

I think so.

 

Also consider that I did the same job, and routed the crank sensor wire across the rear exhaust manifolds, causing the wire insulation to melt and the wires to short out, causing my car to fall flat on it's face whenever it felt like it.

 

Make sure you're not having the same problems.

[stockgp]

i didn't even unhook the crank sensor...

[GP1138]

i didn't even unhook the crank sensor...

 

From the ICM/Coils? There's a two-wire harness that goes straight down from the ICM/Coils to the crank sensor.

[stockgp]

didn't unhook any of that. just set it all aside. i did, however, pinch the injector harness where it runs under the uim.

 

that at least gives me a place to start.

 

i swapped my mom's lumi icm and coils over to my car and it's running now. guess we'll see what happens

[stockgp]

found it. icm and coils are fine.

 

i was pissing around with the icm after the lumi icm didn't help the idle and bumped the vac line on the map sensor. wouldn't you know, idle smoothed right out. thank god for dumb luck

[GIANT MOTH]

hey I went through this same situation and replaced the IAC. That fixed the overall stalling but the needle still jumps slightly on idle. There are ground issues with my circuit but you left off with bumping the map vac line? Was this the line that was the problem or the sensor? I'm thinking about throwing out some cash for a MAP. That should just about cover every single part in this piece of crap.