No problem just a question


Old 02-24-03, 10:15 AM
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Question No problem just a question

As far as idle problems caused by vacuum leaks on GM OBD1 vehicles. Aren't high idles associated with speed density systems and low idles associated with maf systems? thanks
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Old 02-24-03, 10:57 AM
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Depends on the vehicle, problem, condition, etc?

What is the actual vehicle or problem/question? Usually if you squirt something flammable (go easy) on the offending area, you will hear the idle pick up when and if there is a leak.
Old 02-24-03, 12:55 PM
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Question no problem

I had a friend ask me how to hook-up a vacuum gauge on his engine. I had a similar engine, hooked it up on mine, and relayed the info to him. Mine was an 88 chevy 2.8L vin W mfi. The line I tapped had good vacuum at idle, had no effect on idle if left disconnected, did not turn on CEL, did not set a code. I just thought it was weird, that a big vacuum leak didn't effect idle. My understanding is a high idle caused by vac line leak is only associated with speed density systems. the same problem on a maf system would cause low idle, or so I understand. I've never seen a maf system cause high idle because of a vac line leak? I just wondered if anyone had any thoughts on the subject?

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