Question about Buick Rendezvous

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05 rendezvous ok..cleared code for random misfire! changed wires and plugs.. code came back..check engine light comes and goes...tach sometimes show 0-500 rpms but live data fom scan tool shows form 628-800! had overheated before...I drained, flush and refilled radiator..no problem with that lately.. now random misfire code back again...still issue with hard start also...at wits end...dont want to burn money with no results!!!

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  • Buick Master
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Have the fuel pressure tested. If it's low from a tired, old pump, you know-new pump and new fuel filter. Low pressure also causes hard starting.

Posted on Dec 26, 2013

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Posted on Jan 02, 2017

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SOURCE: 99 4runner 5vz-fe 3.4 misfire

I know this post is old, but right on the engine theres a sticker that says use multi-ground plugs only. I read a similar problem like yours and it seemed to turn out that the spark was arcing to ground over the ceramic on the plug. So maybe it could have something to do with the single ground plugs.

Posted on Jan 23, 2009

  • 2 Answers

SOURCE: 2005 chevy aveo Check engine and hold light comes on only over 60

I've become SO FAMILIAR with this problem on my own Chevy Optra. The first time it happened, I took it in to my dealer. It cost me over $100 and I SWORE it would never cost me that again. It really IS the fuel system. (Sticking with Shell's "detergent" gas doesn't help!) Simple solution is to add a bottle of fuel SYSTEM cleaner (not just the fuel injector) and the FIRST sign of trouble or with each oil change. No more problems !! "Live and learn and pass it on !"

Posted on Mar 27, 2011

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