Yet, ANOTHER phantom misfire issue
#51
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Ok...a co-workers husband owns a garage. He performed a compression test and leak down test and it passed with flying colors. He hooked vacuum gauge up and it's drawing high vacuum 27hg. He said something is causing high vacuum...blockage? He said if he was troubleshooting it further, he would take the manifold back off...thoughts?
27hg at idle?? is it idling high? or normal? should be 17 to 21 at idle, its almost as if your ignition timing is to high, but, you cant adjust that,i wander if the egr could have something to do with it,also how does your spark plugs look, are they all a nice tan color, are they all white? or are some white and some dark??could have a lean misfire going on possibly..
#52
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27hg at idle?? is it idling high? or normal? should be 17 to 21 at idle, its almost as if your ignition timing is to high, but, you cant adjust that,i wander if the egr could have something to do with it,also how does your spark plugs look, are they all a nice tan color, are they all white? or are some white and some dark??could have a lean misfire going on possibly..
Plugs are white (looks just like they did when installed 400 miles ago)
No egr valve
Last edited by Brancajd; 11-05-2015 at 06:30 PM.
#53
#54
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My concern is the high vacuum reading. According to vacuum gauge charts, HIGH steady reading indicates choked/clogged air cleaner filter, stuck choke, or restricted air intake. I REALLY do NOT want to dissemble everything again to remove the manifold
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#55
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OK...just for my own satisfaction, I hooked up MY vacuum gauge. Truck warmed up at idle, the vacuum gauge reads a steady 17-18 in hg. When I blip/goose the throttle real quick, the gauge goes to zero, then goes up to 21/22 in hg then back down to 17. To me, it's reading fine..at least, according to the vacuum gauge charts, it's operating like it's supposed to be.
Last edited by Brancajd; 11-05-2015 at 06:35 PM.
#59
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It's been a while since I've read the start of the thread, but have you checked the coil pack and its associated connections?
I still have quite a few of the ignition system components from my '97 I'll send you for shipping. That way, you have some known good replacement parts.
Shoot me a PM if you're interested.
#60