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1996 Impala P0300 madness

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04 Aug 2019 13:47 - 04 Aug 2019 13:48 #32473 by snuup408
1996 Impala P0300 madness was created by snuup408
Hello, I have a chevy 96 impala ss 87000 miles that I bought in april. When I bought it ran fine except lacking all the power I thought it should have especially climbing hills. 3 weeks in I get a blinkin cel light and a p0300 random misfire. Since I didn't know the history I put new distributor ( common with these cars), The code changed to p0300 and p0303. I put wires and plugs, Code changed to p0300 and P0304. Checked fuel and it was 21psi and didn't change when vacuum pulled to solenoid. Replace solenoid and pump. Now 41 psi. Car seemed to be running rich. Had 3/4 of a tank and just from testing and around the block the tank is near E. I cleaned injectors and found 2 leaky injectors, replaced. Front o2's fluctuate nice on scan tool. Back 02' stay in the 800 range.
Sprayed around engine with carb cleaner multiple times. Sprayed wires for arcing. Check and rechecked firing order. Changed coil and module and checked for spark at cylinder 3 and 4, It does. Vacuum gauge fluctuate rapid between 8 and 12. and pulled upstream o2 and vacuum fluctuates too. Was riding fine on the highway and this just hit all of a sudden. Car has 87000 mile on it. I checked and cleaned egr. When I pressed it at idle car died. Any other direction I can go? Thanks in advance.
Last edit: 04 Aug 2019 13:48 by snuup408.

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04 Aug 2019 14:24 #32477 by Cheryl
Replied by Cheryl on topic 1996 Impala P0300 madness
With the vacuum gauge bouncing I’d be looking for a valve spring or guide issue. Do a compression check yet?? And or leak down test

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04 Aug 2019 16:34 #32481 by snuup408
Replied by snuup408 on topic 1996 Impala P0300 madness
Thats my next move. Thanks. Was hoping i didnt have to do it on a LT1. But hey. Ill post my results. Thanks

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