need help master tech
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read my post on misfire on 06 gc with 3. I have done just about everything i can think of, thought maybe you or dogde might have some ideas that i havent done. I used to race 4cyl also years ago, and he is very smart about things
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I added to post late last night, did leak down, almost 0% leakage, can' be burnt valve, would think that would show up under compression, and leakdown. injectors are being pulsed same all the way across, each one, wiring looked fine,
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The more exposure the better. Try:
www.chryslerminivan.net
www.automotiveforums.com
This one gives me all asterisks when I type it then post it for some reason - dodge then talk.com - all one word minus the "then"
www.chryslerforum.com
www.chryslerminivan.net
www.automotiveforums.com
This one gives me all asterisks when I type it then post it for some reason - dodge then talk.com - all one word minus the "then"
www.chryslerforum.com
Last edited by Cougar41; Nov 12, 2011 at 04:14 PM.
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But this is one of those odd ball problem where it pass all conventional test.
You mentioned the compression gauge fluctuate slightly on cyln 1 compare to others, even tho it gave you 180 PSI.
maybe you got a worn rocker arm, try swap it out?
I would say only diagnostic test you can run without pulling engine apart is if you have a Sun Scope from the old days to check spark voltage wave form. That machine tells you wether you have bad coil, lean/rich condition, or mechanical problem.
Another Tool popular in the trade now is a Pressure transducer on a Scope, if you heard of it. It give you a wave form of Cyln pressure rise/drop in millisecond. While our mechanical compression gauge only give us a Peak pressure.
For example, what if you exhaust valve isnt opening properly? you still will have the right peak Compression pressure and No cyln leak.
Other than that, only thing left is a bad PCM(very unlikely), or engine mechanical failure. Thank god the 3.8 engine is still a old school cam in block engine where you can R&R a cyln head in few hours.
When you perform a Leakage test, open radiator cap and see if you got air bubbles coming out of it.
You mentioned the compression gauge fluctuate slightly on cyln 1 compare to others, even tho it gave you 180 PSI.
maybe you got a worn rocker arm, try swap it out?
I would say only diagnostic test you can run without pulling engine apart is if you have a Sun Scope from the old days to check spark voltage wave form. That machine tells you wether you have bad coil, lean/rich condition, or mechanical problem.
Another Tool popular in the trade now is a Pressure transducer on a Scope, if you heard of it. It give you a wave form of Cyln pressure rise/drop in millisecond. While our mechanical compression gauge only give us a Peak pressure.
For example, what if you exhaust valve isnt opening properly? you still will have the right peak Compression pressure and No cyln leak.
Other than that, only thing left is a bad PCM(very unlikely), or engine mechanical failure. Thank god the 3.8 engine is still a old school cam in block engine where you can R&R a cyln head in few hours.
When you perform a Leakage test, open radiator cap and see if you got air bubbles coming out of it.
Last edited by steak59; Nov 12, 2011 at 04:50 PM.
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I sure appreciate all the help, The last thing i did before going home friday was take off the rocker shaft and look at them, also took off springs to see if valves were sticking in guides, gaulded or something, everything still looks good.
