Help with odd idle issue.

[duffman1278]

Alrite for some reason my SR starts up fine, vacuum reads good, usually 16-17mmHg at idle. When I drive it drives just fine, doesn't bog or stutter. However when I get to a stop light, the car will idle fine for about 30 seconds, then all of a sudden, the idle drops from 850 to 500(or something close to that area) and it acts as if it wants to shut off.

It also shakes the car. It does this everytime too. Get to the stop, no issue, then a few seconds later, it drops idle, then eventually picks itself up.

-I ran a boost leak test on it, and I fixed the one leak I had and it still did it. -Check my vacuum lines, all are brand new lines.-Cleaned the IACV, and still the same issue.-BOV is recirculated.-Readjusted TPS to make sure and check if its working, it is.

[duffman1278]

bump

[wzntha]

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[duffman1278]

Hmm, I was thinking about buying a new IACV and puttin that in. But I'm going to be swapping MAF's this weekend with my friends to see if that fixes it.

Yea I'm from socal =] I did the swap myself, but the guy who did my wiring was really good, so I doubt it has anything to do with it. I got it done from a local.

[wzntha]

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[duffman1278]

Yea thats correct, well I think you only need to remove the top half of the manifold.

[boro drift]

I had to pull them both.

[duffman1278]

Aww lame, but still no ones chimed in about the issue.

[jaco]

I have the same exact issues, iv even posted people about it (idles stedy at first stop ,then a rpm dip and 15-17 vac...was told its a leak, tested the system, cant find it....kept it moving. does it still run...yes is it still annoying as hell ..... yes ,just waiting for someone to comment in and tell yous that its cause your bov isnt recirculated, but wait, you said it is didnt you

[duffman1278]

Yup, recirculated.

[wzntha]

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[duffman1278]

I'm thinking it is, but I fixed my boost leaks, i just ran a leak test this weekend, and fixed them.

[nzmoman]

did you figure out how to fix your idle problem yet?

i think i actually do have a boost leak that might be causing my car to idle weird. today, i just noticed that my turbo wasn't spooling like it used to. it would be at around 2 psi @ 2200 rpm and it would stay at 2 psi until 3000 rpm before the boost goes up again. so does this seem to be a boost leak? if so, it might be possible that a very small boost leak is what is causing these idle problems and we don't notice it until it starts getting worst...well, that's my guess, haha.

when my first sr car did that it was the turbo coming loose at the manifold. In my experience, anytime I have had a leak in boost the car sputters, and is worse when you are driving and modulating the throttle....

when the turbo starts to come loose, it doesn't do that as bad, it just spools really poorly because its not scavenging exhaust well...but it still is getting enough that it can make a little pressure.

so I would just check to be sure. If its loose you don't want it coming completely off while you are on the road somewhere without tools.

just a suggestions and just in case...

[wzntha]

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[duffman1278]

Bump, anyone else?

[Tulsa_S-13]

Usually simply cleaning the IACV results in being a temporary fix. The symptoms you describe sound like every other IACV problem I've ever seen.

Replace the IACV and your problem will probably be solved.

[redsx13]

did you ever fix the problem?

[duffman1278]

Yup, I think it ended up being my MAF, or a MINOR boost or vacuum leak.