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I have a 94 SC 5 speed and I cannot figure out what's wrong with it for the life of me. First thing's first. When I start it up when its cold it idles at about 1500 rpms and goes down to 1000 after about a minute. When I'm driving and I push in the clutch the rpms only drop to about 1000, but as soon as I come to a complete stop, they drop to normal idle after the car has warmed up a bit. This happens all the time. Next, my check engine light comes on every so often and when it does the car really acts up. It seems like it acts up more often when it's warmer and humid out, but it will still do it in the cold too. If I'm accelerating as soon as I hit the clutch, the rpms shoot up anywhere from 3 to 600 rpms. Now, I'm no expert but as far as I knew when you clutch, as long as your foot is off the gas the rpms should fall almost immediately. When this first started I had the computer scanned and got codes for the MAF and the TPS which I replaced. This didn't fix anything and now the car wont throw up any codes. Just recently I replaced the Idle Air Control with an OE from the dealer. Could my BAP sensor be a problem? I'll take any suggestions. I've been struggling with this for over a year. It's extremely aggravating!!!!!!!!!!!!!!!!
 

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Fry Rice Specialist
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4,794 Posts
is the tps sensor properly adjust?

is the throttle return spring is on the throttle body properly?
 

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I have zero expriance with our computers so i dont know if you can do this, but if this were an OBD II car i would hook it up to a scanner and look at the MAF, TPS, and other relevant sensors. Check thier readings at cold idle, warm idle, WOT. everything you can. This check includes sensors/connections/wires. If all your data is good, have a friend wiggle wires while u watch the readings. intermitten things arnt easy.

Also check for any air leaks after the MAF. I like to take some brake clean and spray it around possible leak spots. If you engine reacts with a sputter you know its sucking in that cleaner.
 

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As far as I know, Autozone or any other place won't pull codes if it's not 96+ OBDII. His car wouldn't qualify. You can read the codes yourself with a jumper wire that will make the CEL blink the code, but I don't have any diagrams to show you which wires to jump together.
 
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