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02-29-2012, 02:36 PM | #1 | |
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Location: Sugar Land, Texas
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Crazy engine issue. Need help
Ok. More or less, engine starts to stumble or miss fire without throwing a misfire code at about 3500 rpm. So bad you can almost not drive it on the highway. I have replaced the following parts.
Ignition module Fuel filter Plugs Wires Cap Rotor Coil Cam sensor Crank sensor (had the cam and. Rank corilation set) Battery Had a new ECM flashed and tried that Fuel pressure is good New fuel pump. I think that's all. The only code it keeps throwing is a cam sensor fault I believe it was a int. voltage or signal loss. I going crazy here has anyone had this issue before if so please help. |
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02-29-2012, 05:38 PM | #2 | |
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I had issues with a misfire on my 97 GMC. I replaces cap, rotor, plugs, wires, coil and it continues.
It ended up being a worn distributor gear. Replaced the distributor and she's running great. |
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02-29-2012, 07:14 PM | #3 | |
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Re: Crazy engine issue. Need help
that is a very good list of parts replaced. problem is what vehicle / year/ engine are you having issues with . that would help us figure out what is needed.
also provide what testing you did prior to replacing all those parts and if you or some other person shop is doing the work/troubleshooting. when you post back with the details give any dtc failure codes and the measured fuel pressures. give code numbers ! |
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03-02-2012, 03:03 PM | #4 | |
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Re: Crazy engine issue. Need help
Sorry it is an 1998 Tahoe 4x4 2 door
5.7 liter |
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03-02-2012, 05:16 PM | #5 | |
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Re: Crazy engine issue. Need help
as a guess the distributor is most likely in need of replacement. after the fuel pressures are measured 60-65 psi .. then check for any rotor movement of the distributor. if you do get it to move then its worn causing miss fires and bad running at the higher speeds.
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03-02-2012, 11:10 PM | #6 | |
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Pop the cap off and see how play the rotor has. I can't remember the exact amount of play that's acceptable but it's not much.
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