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Old 12-17-2003, 09:09 PM
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1989 s10 blazer 4x4 4.3L

so my moms blazer is acting up recently, at an idle and low speeds especially turning it will just start to studder like its having a fuel delivery problem. we changed the fuel filter and it seemed to go away for awhile but recently its been really bad. so today we changed the cap/rotor/wires/plugs and its still doing it.

its a 4.3L and has 200ks

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Old 12-17-2003, 09:15 PM
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Check your fuel pressure....may be a bad fuel pump.


Also, get engine codes checked, for a bad sensor.
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Old 12-17-2003, 09:16 PM
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i heard maybe it could be the pcv?
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Old 12-17-2003, 09:17 PM
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Change it....only about $5
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Old 12-18-2003, 03:33 PM
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could it be a dirty injector? and how do you go about checking the fuel pressure
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Old 12-22-2003, 01:15 PM
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On my 92 I had similar problems. There is a tap on the supply line near the back of the plenum for checking fuel pressure. You have to maintain hi pressure if its fuel injected, and even a few pounds under the recommended pressure can cause problems like you are experiencing. Mine was running at about 57 and it should have been 60. I replaced the fuel pump (in the fuel tank) and it ran fine after. Be sure to buy a pump at your GM dealer as the ones at Autozone and other discount outfits only run something like 4 poles in the motor while the GM pumps run 8 poles (the more poles the better the motor) which will last lots longer.

Shortly after my supply line feeding the regulator in the plenum leaked and I had to rebuild the lines. The spider lines were ok. When this occurred it ran like ***** big time. You might want to check that out also. The kit was like $80 from CarQuest.

Just hope its NOT an injector as those babies run several hundred dollrs each!
Mike
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