Thread: 454 running bad
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10-06-2005 02:18 PM #1
454 running bad
For those few that were following the other thread. The engine is still not running good. compression check is good. Could EGR cause this to that extreme.
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10-06-2005 02:32 PM #2
i dont know what was said before, but the EGR valve most of the time causes a vac. leak idling. going down the road the EGR shouldnt make a lot of dif. spray it with carb. cleaner see if the motor idle up.Mike
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10-06-2005 04:44 PM #3
The engine seems to be running good at idle. When you give it gas the vacuum drops and it runs like crap. I know it't supposed to drom some but it drops to zero. Still can't find a leak. Before it got to point that it ran bad all time above idle. I could be driving down road and it would loose vaccuum start running bad then recover and run good, or it might get to point that it would die.
I am still as confused as ever.
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10-06-2005 05:58 PM #4
Brake booster leaking???
Distributor slop (bushings)?
Distributor vacuum advance leaking?97' AWD c/w 5" lift
325/60 15's
Diamond Racing custom 10" rims
ZZ 502 Ramjet
PATC 4L80E
Compushift controller
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10-06-2005 06:21 PM #5
i think you'er looking at the vac. gauge to much. if you have 15 + inch idling thats ok. a vac. gauge after that dont tell you much unless you have a lot of experience reading it. it jumps all over the place when ging down the road. what is your vac. reading at 800 rpm's and what is the car doing.
ps, what are we working on.????Mike
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10-06-2005 06:49 PM #6
what is the fuel psi
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10-06-2005 07:11 PM #7
i had a chevy truck that did not pull any codes i check all the grounds like my good wrech friend told me. after he could not pull any codes. it was the chip are you shure it is not sucking vacuum in the in take valley the intake is aluminum get hot and leaks?or the ccm computer?
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