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97 Sl2 Mis-fire Under Load

I have a 97 sl2 with 127k on it and under a load it mis-fire i chec

fuel pressure it's 36-42 from idle and when brake torqued. I als replace wires ,fuel filter and pcv . my next guess is fuel injector because i think it's fuel related because all coil pack are firing ok also has engine lite on for egr and cat-converter. i replace egr wit two use ones with no difference

-- fort

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forty
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Have you tried a OBD2 port code scan???

----------------- TheSnoMan.com

Reply to
SnoMan

Operating Pressure should be 40-55 psi.

Wires should be below 12,000 ohms. Are they?

What plugs did you use?

Do you have egr and converter codes?

Reply to
BläBlä

Had the same issue. went the same route with troubleshooting. Turned out is was a broken intake manifold gasket.

Paul

forty wrote:

Reply to
Paul

Doh! Before your guessing costs you even more money and still doesn't fix the problem, please consider either having the codes read and/or getting a diagnostic performed at your local Saturn dealer. If it saves you from having to replace ONE part that you don't need to, it has paid for itself.

Lane [ lane (at) evilplastic.com ]

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Lane

Reply to
Paul

Have you checked #1 spark plug?

Reply to
Doug Miller

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