Idles Roughly

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Aug 27, 2009 | 07:22 PM

#11

nubuck83

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Does not sound like the vss. sounds more like your ignition coil is making your rpm's go all over the place. research tachometer and your car on google and you will get plenty of info on it.

Aug 28, 2009 | 06:32 AM

#12

JimBlake

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Joined: May 2006

Posts: 18,398

From: Wisconsin

On a 1991 Accord, the tach signal comes from the ignitor, not from the coil.

Aug 29, 2009 | 02:17 AM

#13

SlyBlackDragon

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Joined: Mar 2009

Posts: 19

Quote:

Originally Posted by Drkmstr104

My idle speed was having problems similar to yours, but that was because I overfilled the AC and it was too much for the engine to turn, it would drop to 100 rpm and nearly stall! I also noticed that higher octane fuel decreases the idle rpm speed, are you using regular or premium? If you havent fiddled with the AC then its some other problem, ignition related problem, but you seem to have covered most of the ignition system. You should check the plugs to see if theyre fouled.

When my AC is on my car feels like 2x slower, so the sluggishness you described seems like it would be from the AC, which sucks 10hp + from the crank, I keep my windows rolled down unless Im on the highway now. You said you turned off the AC and it still idled roughly though right?

I haven't changed anything with the AC, so that isn't it. Turning the AC off when it is running rough/ trying to stall doesn't help any. I haven't checked to see if the plugs are fouled, but wouldn't it be a constant problem and not a sporadic issue?

Quote:

Originally Posted by JimBlake

You said the sparkplug wires gave you a shock. But you didn't say you replaced them...

Try to remember what kind of spark plugs you bought. NGK is bets, ND is good, but people have had trouble with others, especially Bosch.

I didn't replace the spark plugs, but I did install new wires. I don't remember the brand but they are less than 5 months old so I assume they are still good.

My girlfriend's father is a master mechanic (he was out of town at the time) and said he will try and come over this weekend to have a look at it. He said he thinks it is a vacuum line or something like that.

I guess I will wait and see unless anyone knows something off hand to try for now.

Aug 31, 2009 | 07:55 AM

#14

JimBlake

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Joined: May 2006

Posts: 18,398

From: Wisconsin

There should be a drawing of the vacuum hose routing on the underside of the hood, so DO check that out. Cracked hoses leaking? Old hose collapsed under the vacuum?