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Old 06-19-2016, 07:41 PM   #15
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Burned exhaust valves can do this.
Compression test!

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Old 06-20-2016, 06:47 AM   #16
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The catalytic converter was taken of it.

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Old 06-20-2016, 10:26 AM   #17
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Putting new EGR valve in today, should now tomorrow he is going to test dtive it.
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Old 06-20-2016, 08:09 PM   #18
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Originally Posted by 92TNTRacing View Post
New cap. rotor, plugs and wires ? Check the firing order maybe 2 and 4 are switched ?

Two and Four are probably crossed.
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Old 06-20-2016, 09:03 PM   #19
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Originally Posted by jelag View Post
Does your vehicle have an EGR valve & catalytic converter on it???

Please follow along... vehicles with EGR Valves can have issues with the valve and it leaking... or possibly a problem with the manifold...

If when you pull a plug wire... and the engine seems to run smoother.... here is what is going on... that raw fuel... is leaving the exhaust valve, crossing over the passage in the intake manifold... and flowing through the EGR valve that's bad... and that raw fuel is enriching other cylinders and making the engine run smoother as the mixture is richer....

The EGR valve system is designed to work ONLY when your running down the highway and its a method to displace some of the air/fuel mixture in the combustion chamber with inert gas.... this lowers temperatures and emissions.... if the valve/mounting gasket/etc is bad... and is off its seat during low speed or idle operation it can make the engine miss...

Remember that at idle and low speed the throttle plate is closed... thus an engine that would normally have 150 psi compression, now with the throttle plate closed will have maybe 75 psi.... and the air/fuel ratio must be exact for good combustion... with the EGR off its seat... this can't happen...

Hope this helps...

BTW - most people have long since pulled the vacuum line off this valve so it can't function... that doesn't mean the valve is bad... one of the simple tests is to put some propane or other chemical on the shaft of the valve... if the chemical runs down the shaft and the engine smooths out... the valve is bad... OR pull the valve off the engine and pour raw chemical (carb cleaner/brake clean) and see if the chemical migrates past the seat...
Propane???? Hope you intended to say oil.
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Old 06-23-2016, 10:52 AM   #20
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EGR valve was stuck open, and the plug wires did not carrying enough spark.
Thanks for every ones help.
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Old 06-23-2016, 03:39 PM   #21
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It's done I can pick it up!
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Old 06-23-2016, 04:00 PM   #22
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Originally Posted by schulzee View Post
EGR valve was stuck open, and the plug wires did not carrying enough spark.
Thanks for every ones help.
Great hope that ends your problem! I just hate not knowing what's going on with my rig ! Real glad when things get back to normal !!

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