7AFE Runs rough when cold, Until the car gets close to warmed up, the engine runs poorly Options

[Bitter]

you dont have one of those sensors.

[GriffGirl]

you dont have one of those sensors.

Well I guess that's good because I don't have $300 to replace it, either!

So then I'm back to square one. Ugh. Anyone? Anyone? Bueller? Bueller?

[Bitter]

i havent had the cold start problems again yet this year.

ive changed the O2 sensor, thermostat, and cleaned the throttle body/iac VERY well a couple times. might go after the IAC, mine was gunky and i didnt even know it! i cleaned it and the warmup idle got alot higher. i could understand it stumbling if the IAC was commanded X amount open but wasnt passing that amount of air, the engine would be adding too much fuel and wouldnt run well till the idle speed dropped and it started to read other sensors.


i had not only sucked some seafoam into the engine, i used the deep creep spray and let it soak on my throttle body and IAC and wiped it out very well.

[GriffGirl]

This morning I put Seafoam into the gas tank and sucked it into the engine as well (that was kinda scary, but in a really cool way). I'll have to wait until I leave work this evening, when the engine is cold again, to see if that worked.

I've decided I think this weekend given it'll probably be the last sunny one for 8 months that I'm going to clean the throttle body and the IAC valve. Is the IAC valve something that I just remove? I have a diagram of where it's located but haven't looked at my car yet for it.

Also, is the deep creep stuff Seafoam too, only a spray version?

Thanks (again!)

[Bitter]

deep creep is just seafoam in a spray can, makes it easier to get into the IAC. you can take the IAC off but that can be a pain and hard to get at. i just sprayed some down into the passages and let it sit. if you look into the throttle body and you'll see a passage at the bottom, then open the throttle and theres another passage on the other side.

[Bitter]

well its back for me as well. only seems to happen when its around freezing and only for about 45 seconds. the afr dips off way rich, past 10:1. i wonder if the IAT is slightly out of range and the cold temp makes it worse? i may grab a new one or pull mine out and toss it in the freezer and check its resistance against the specs it should be at.

[GriffGirl]

well its back for me as well. only seems to happen when its around freezing and only for about 45 seconds. the afr dips off way rich, past 10:1. i wonder if the IAT is slightly out of range and the cold temp makes it worse? i may grab a new one or pull mine out and toss it in the freezer and check its resistance against the specs it should be at.

I know this was only a few days ago, but I was wondering if you did that yet and what your findings were. I'm gonna attack this btch again this weekend, it's colder now and my car is running SO SO poorly before it warms up that I'm feeling VERY discouraged and hateful towards it.

I'm trying so hard to keep my chin up, but man, this thing sucks so bad it makes me wish I didn't have it at all... but I do so love the beautiful 6GCs!

So far I've replaced plugs (NGK Platinum), checked wires cap & rotor (look great, they're only a few months old); replaced IAT sensor, replaced thermostat. Oil changed last month w/1040 synthetic blend, name brand just can't remember which (red bottle, Castrol?).

Goal this weekend is to clean throttle body, IAC valve and quite possibly replace fuel filter.

Lemme know what you figure out, if anything. I don't have the money to take it to a mechanic, but I may just have to, at least to have it diagnosed. Unless someone in the Portland area is feeling especially friendly.

[Bitter]

i havent had the time to get back into it more, im going to ask my boss (a more experienced mechanic) his thoughts on it. and try to get the scanner onto it as well.

[wind]

any updates? im having the exact same problem and arnt getting many results

[GriffGirl]

any updates? im having the exact same problem and arnt getting many results

See this thread for latest stuff (I didn't wanna jack your thread)