Why won't my car idle right? |
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Why won't my car idle right? |
BPGREER |
Nov 16 2004, 06:36 PM
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#1
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Member Group: Members Posts: 131 Joined: 29-September 04 From: SAN FRANCISCO Member No.: 2,857 |
OK, I'm once again stumped. My car just won't idle smoothly. It sounds like it's going to die, but then revs itself up a bit, then almost stalls again, then revs again... So, I thought it might be a vac leak. I had already replaced all of the hoses, but found that I had leaks on the air intake runner things, where they connect to the plennum. So, I disassembled everything, replaced those hose-type things, and voila! No more vac leak there. Problem is, still not idling right. It's just as bad now as before. One more thing, I slowly brought up the rpms from the throttle body, to listen, and I think I heard a couple of really quiet backfires. Maybe an exhaust leak? Could this cause a bad idle? Thanks.
Brian |
mike_the_man |
Nov 24 2004, 11:50 AM
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#2
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I like stuff! Group: Members Posts: 1,338 Joined: 11-June 03 From: Regina, Saskatchewan, Canada Member No.: 809 |
To test vaccuum, you need a vaccuum gauge. I bought one, but most local FLAPs will loan them out. First of all, pull a vaccuum on the MPS, around 15in/hg, I think. If the vaccuum drops, it needs to be fixed or replaced. I believe the acceptable levels are listed on Brad Anders page, I can't remember them off the top of my head.
If the MPS checks out good, then just T in the vaccuum gauge in the line that goes to the MPS. The engine should pull a steady 14 - 15in/hg at idle. If the gauge fluctuates too much, that could cause an unsteady idle. At this point I'm pretty much guessing, but these are pretty easy things to check. Let us know how it goes. |
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