What's happening? Everything I check is okay!
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Joined: Oct 1999
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From: Greenwood, IN USA
Car: 1990 Iroc/Z
Engine: LB9 305 TPI
Transmission: Borg Warner 5 speed
What's happening? Everything I check is okay!
My car lately has started to kind of hesitate. I thought that it might be due to a faulty fuel injector, from past experiences, but all the injectors check out at 17.1 to 17.8 being the highest resistance. They all fall within that range. I also thought that it might be arcing of the wires, but I can't see any signs of that either. My fuel pressure was down to 39.5 psi (I thought I had set it higher, but I didn't have a gauge when I set it the first time) when I checked it also, so I've turned it up to 47psi (I have a 305 TPI). I tried to check to see if my EGR valve was stuck but I couldn't get my fingers in there to see if it would move. The car isn't setting any codes, so I don't really know what to check next. Sometimes when I'm driving (by the way it's a 5 speed T5) I'll be cruising up to 3000 RPM and then it sounds like it's misfiring. Do you think that maybe my MSD 6A box is malfunctioning? I've heard that if you don't use the rubber grommets that it won't function properly after a while because of vibrations. Is that true? Mine and my brother's boxes didn't come with any rubber mounts. So therefore, I couldn't use any. What do you guys think? It doesn't do this all the time, when it does do it, I notice it mostly in overdrive at 50 MPH that's when the hesitation is the worst.
[This message has been edited by 90Iroc (edited February 02, 2001).]
[This message has been edited by 90Iroc (edited February 02, 2001).]
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Joined: Sep 1999
Posts: 411
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From: Bartow, FL
Have you tried checking the timing, cap and rotor, ect? It might just need a tuneup.
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'87GTA w/ SLP Cold Air, MSD Coil, Airfoil, Gutted MAF, AFPR, TES Headers, HI-FLOW CAT, Flowmaster Catback, Energy Suspension Master Bushing Kit
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'87GTA w/ SLP Cold Air, MSD Coil, Airfoil, Gutted MAF, AFPR, TES Headers, HI-FLOW CAT, Flowmaster Catback, Energy Suspension Master Bushing Kit
Thread Starter
Member
Joined: Oct 1999
Posts: 271
Likes: 0
From: Greenwood, IN USA
Car: 1990 Iroc/Z
Engine: LB9 305 TPI
Transmission: Borg Warner 5 speed
I thought someone might mention timing last night as I was writing this. The plugs, wires, cap and rotor, are only about a year and a half old, possibly two years old at the most. The plugs don't even have 12,000 miles on them yet, I don't think. I'll have to find the receipts. I'll check the timing tomorrow, it's probably okay, I don't go messing with the timing, so I should be alright there, but it never hurts to make sure. Thanks
Any other ideas?
Any other ideas?
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