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#1
08-30-2004, 01:34 PM
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99 Suburban shakes when climbing
My 99 Suburban shakes violently when climbing- I usually have to slow down to 50-55 mph. It feels like the engine is about to drop out of the Suburban. The service engine light ALWAYS comes on when this occurs. After a day or two, the light goes off. The dealership said the pistons were probably missfiring-tested it-they work fine. No one seems to have any answers, and it has gotten worse!!!! I have read the previous posts regarding this problem, but if anyone has anything new or different- it would be greatly appreciated! Thanks
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#2
08-30-2004, 03:59 PM
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Re: 99 Suburban shakes when climbing
probally what is happening is the valves are sticking in the guides causing your misfire and lack of power.
This usually occurs when the engine is hot and is under a load (highway speeds, climbing hills). I would check for proper operation of the fuel injection system and the secondary ignition first, but I would say most likely the heads are going to have to come off
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#3
08-30-2004, 05:26 PM
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Our '94 did that( like it was kickin back) after a tune up and I thought it was the tyranny. Turned out one of the spark plug boots had come off a plug. One my son had done. So check all your wires and plugs also.
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#4
09-02-2004, 04:00 PM
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Re: 99 Suburban shakes when climbing
I had a '99 do that with a 5.7 engine. Tried plugs, wires, cap & rotor but the P0300 random misfire kept coming back & it would still start sputtering up long hills. I was finally told by GM to try the fuel injectors (supposed to be a fairly common failure). Not knowing which to replace @ $55 each I took off the injection connector by the throttle body, tested each with an Ohmmeter & found all read the same. So I cleaned & applied dielectric terminal grease to the connector & haven't had the problem since.
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