Question about Chevrolet C1500

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1997 Z-71, 5.7 vortec. Let truck sit for 3 days. When started up, idled rough. Take off is slow. changed plugs, no good. what next?

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I would check the fuel pressure regulator, remove the vacuum line from it and start the engine. Look for fuel coming out of the vacuum port on the regulator. If you see fuel, replace the regulator due to a ruptured diaphram

Posted on Oct 16, 2010

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Idling rough


misfire spark plugs coils wires did you wash engine water gets in under the intake to the plugs first if with a scanner check codes p0300 change plugs p0301 or 2 or 3 or 4 its one of the cylinders i would try just changing all the plugs first and start from there

Apr 18, 2014 | 2000 Kia Sportage

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I have a 1993 chevy s-10 blazer 2wd with a 4.3. vortec and it sometimes idles rough and when it does black smoke comes out of th exhaust i have changed the plugs wires rotor button and distirbutor cap and...


two things pop to mind with this truck, first these motors are notorious for having bad intake gaskets take a flashlight and look very carefully around the valley of your intake/block-head seal you'll possibly see either antifreeze leaking or a weird looking whitish or greenish sort of foam you can also use propane around the seal and look for obvious idle changes, I have done tons of these intakes in my shop, the other two things I would suspect if that looks fine are 02 sensors, or maf sensor.

Dec 29, 2013 | 1993 Chevrolet S-10 Blazer

1 Answer

I swapped out the plug wires and plugs with Denso, while I had the covers off decided to wash engine, engine ran fine. Next day started engine and the idle constantly oscillated between 1200 to 1400 RPM....


You are right this is a classic MAF problem or rather the air mass meter AMM which is the MAF working with the closely associated intake air temperature sensor IAT(a little bead like thermistor on wire sitting close to the MAFF in the air stream). The ECU was getting poor information from the MAF. The ECU had to rely on slow input signals from the IAT and feedback from the oxygen sensor on the exhaust to keep the engine running. The ECU hunted for the right mix, first rich and then lean but never settling hence the 'surge and slow' of the engine revs. When you disconnected the MAF you also disconnected the IAT and now the ECU had just the one signal from the oxygen sensor to depend on and so now provides a slightly rich mix giving the rough idle. You have done the hard work just change the MAF and IAT assembly.

Aug 19, 2010 | Lexus LS 400 Cars & Trucks

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96 gmc vortec will not start


I AM LOOKING AT TIMING ISSUES OR INTAKE MANIFOLD LEAK.OR EGR VALVE STUCK OPEN.

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Rough Idling, start-up early morning, until engine heats-up


HAVE THE COOLANT TEMP SENSOR CHECKED TO SEE IF IT IS FUNCTIONING PROPERLY.HOPE THIS HELPS. BEST OF LUCK. LET ME KNOW?

May 04, 2009 | 2001 Jaguar S-Type

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