Should the upper intake ever be too hot to touch?

GRGT1994 · Aug 31, 2005

I just got my car back from the shop. They fixed my short/fuse issue. But now I seem to be overheating.

The mechanic said that it was running quite rich (expected since I put a FP and injectors in, and don't have a tune yet). So he adjusted the IAC (I believe) to lean it up a bit.

Well, I got all the way home running fine, but a little rough once I got home. Then I took it back out to drive it a bit more. And it ran really rough (didn't sit long enough to cool off in between).

So when I got back home the second time, I looked under the hood. Heat vapor trails are streaming off the engine, and the upper intake is freegin hot. WTF?

Does it sound like overheating? Stock engine temp gauge reads normal, and I had no pinging.

I'll be calling the shop tomorrow, of course, to find out exactly what they did to lean it up.

Any ideas?

legalize420 · Aug 31, 2005

too hot to touch, yes. even after my car sat for a half hour to an hour i could not take my upper off with bare hands.

GRGT1994 · Aug 31, 2005

Ya, but are you seeing vapor trails?

legalize420 · Aug 31, 2005

GRGT1994 said:
Ya, but are you seeing vapor trails?

yes, i have seen them before but never though anything of it considering how hot it was outside and it didnt seem out of the ordinary.

CManT1914 · Aug 31, 2005

My upper intake gets damn hot, although I don't see steam or anything like that coming off it. And how the hell is adjusting the IAC supposed to lean out the engine?

GRGT1994 · Aug 31, 2005

OK, found the new problem. Balancer fell off. Time for a new thread.

CManT1914 · Aug 31, 2005

GRGT1994 said:
OK, found the new problem. Balancer fell off. Time for a new thread.

WTF?! The balancer fell off??!

super302 · Aug 31, 2005

CManT1914 said:
WTF?! The balancer fell off??!

I'm also wondering what the IAC has to do with a/f ratio

GRGT1994 · Aug 31, 2005

Good damn question. Maybe he was talking about that other black box hanging off the throttle body? I don't know, I stopped listening when he said he got it running again. I'll obviously be following up on that tomorrow.

mo_dingo · Aug 31, 2005

Yeah, obviously the guy has no idea what he is doing. What a douche.

And yes, intake should be hot. After all, the motor is hot, and aluminum conducts heat very well.

You can take a infared thermometer and check the temp of the block when it's warm. That will tell you if your gauge is working still.

Where is this "vapor" coming from exactly. Please ellaborate.
Scott

GRGT1994 · Aug 31, 2005

Ever look out across a parking lot on a hot day and see the heat waves bending light as it streams up? That's what I'm talking about - really hot.

CManT1914 · Aug 31, 2005

GRGT1994 said:
Good damn question. Maybe he was talking about that other black box hanging off the throttle body? I don't know, I stopped listening when he said he got it running again. I'll obviously be following up on that tomorrow.

The TPS? lol, don't think that'll be effecting a/f ratio either.

GRGT1994 · Aug 31, 2005

Wait a second. The IAC controls the amount of air allowed into the engine at idle, right? That's why it's called the "Idle Air Control." So how does that not affect the air fuel mix at idle?

I'm no master mechanic (not even a good hack driveway mechanic yet), but that seems to make sense to me.

CManT1914 · Aug 31, 2005

GRGT1994 said:
Wait a second. The IAC controls the amount of air allowed into the engine at idle, right? That's why it's called the "Idle Air Control." So how does that not affect the air fuel mix at idle?

I'm no master mechanic (not even a good hack driveway mechanic yet), but that seems to make sense to me.

I'm not saying it doesn't do it at all, but it's not gonna do it while you're driving.

S/CBlack95GT · Aug 31, 2005

GRGT1994 said:
Wait a second. The IAC controls the amount of air allowed into the engine at idle, right? That's why it's called the "Idle Air Control." So how does that not affect the air fuel mix at idle?

I'm no master mechanic (not even a good hack driveway mechanic yet), but that seems to make sense to me.

At idle the AF/R is controlled by readings from the O2 sensors. If they sense too much O2 the comp increases the injector pulse to richen it up. If the IAC was opening too much the idle would increase for one and secondly the CIL would come on.

Should the upper intake ever be too hot to touch?

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