I have a 1987 Fiero GT 2.8 that idles around 2000-2400 rpms. When I remove the snorkel on the intake an put my finger on the hole in the bottom , the idle drops to 900, what do I need to do to fix the idle speed?
If you covered the hole you ruled out an IAC issue. Look for a vac leak. Some culprits are the plastic lines, the egr tube, the brake booster line, etc.
You can use a 'smoke test'. I've always wanted to try it!
Engine off, basically you suck up a bunch of smoke and blow it into the intake via one of the small pipes...where the smoke comes out is your leak...check utube for examples of this.
I don't a few puffs on a cigar can't hurt right? If you get cancer don't blame me though ha ha.
If you covered the hole you ruled out an IAC issue. Look for a vac leak. Some culprits are the plastic lines, the egr tube, the brake booster line, etc.
You can use a 'smoke test'. I've always wanted to try it!
Engine off, basically you suck up a bunch of smoke and blow it into the intake via one of the small pipes...where the smoke comes out is your leak...check utube for examples of this.
I don't smoke but a few puffs on a cigar can't hurt right? If you get cancer don't blame me though ha ha. Maybe get a buddy or your child to do it to be on the safe side (did I go to far?).
Okay, I loosened the EGR and slid a piece of aluminum soda can in and retightened. Now idles at 900 rpm, what would be the effects if I just ran it this way? Where I live there is no testing of emmisions.
Here is a thread with awesome EGR information. I'm surprised you haven't gotten a code 32 trouble code yet.
I didn't read all four pages of that thread, but there's a big difference between an EGR solenoid problem and a cracked EGR tube (and/or a faulty EGR valve).
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Originally posted by jimbolaya:
The block off plate is probably stuck open in your current EGR. That's why when you manually block it, it goes back to proper RPM's.
We need to know where exactly the OP stuck the "soda can". Was it where the EGR tube mounts under the upper intake, or was it where the EGR tube connects to the EGR itself?
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Originally posted by NiotaFiero:
Okay, I loosened the EGR and slid a piece of aluminum soda can in and retightened. Now idles at 900 rpm...
Or is the soda can actually between the EGR assembly and the exhaust crossover?
[This message has been edited by Patrick (edited 09-21-2013).]
It is between the egr tube and the upper intake. It's where you have to remove the dist. cap and rotor button ,and it's still a pain to get to , to lossen two 10mm bolts.
[This message has been edited by NiotaFiero (edited 09-21-2013).]
Well I was assuming when he typed EGR, he meant EGR and not EGR tube, but I should never assume. However, vacuum does travel through the EGR when that block plate is open. so if its stuck open, I would imagine that would cauae a high idle. It is something to check.
Yes, sorry, I meant to say between the EGR Tube and upper intake. After sitting over night I start car and high idle is back. Could it be the IAC since it idles down if I remove the IAC and plug the hole with my finger? Or would it be the EGR is stuck either open or closed?
[This message has been edited by NiotaFiero (edited 09-23-2013).]
That 900 you saw is pretty close after warm up. I wouldn't try to change it. Now that you put the blank between the EGR tube and the manifold and the rpm's dropped to normal, try this next. Place the blank between the EGR tube and the EGR. If the idle is now back up high then the tube is cracked. If not, then there is something wrong with the EGR.
[This message has been edited by n7vrz (edited 10-03-2013).]
Thanks, I found a leak in the egr tube and repaired it with a steel epoxy and removed the blank and now get @idle 900-1100 rpms. If I press the baffle in the egr and put my finger on the vaccum stem on the egr and release the baffle-it doesn't hold, the baffle immediately returns to the original position. Does this mean that the egr is bad ?
Thanks, I found a leak in the egr tube and repaired it with a steel epoxy and removed the blank and now get @idle 900-1100 rpms. If I press the baffle in the egr and put my finger on the vaccum stem on the egr and release the baffle-it doesn't hold, the baffle immediately returns to the original position. Does this mean that the egr is bad ?
I took the egr off and cleaned it with carb cleaner and put city back on, seems to be working now, now it holds vaccum when pressed and inlet is held. Didn't have a new gasket but I guess I'll get one and install it just to be sure.
[This message has been edited by NiotaFiero (edited 10-05-2013).]