Question about Jeep J10
Backfiring when i rev it up + missing at fast idle/ almost shuts off. the engine is a crate with low miles, like i say it ran great before i took the head off. the engine is super clean internally. definitely never been hot at all. my problem has to be with valves not opening and closing at the correct time. when i adjust valves to no lash the bolts are barely tight. im affraid of getting them too tight but maybe ive got them too loose?
Posted by Anonymous on
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Posted on Jan 02, 2017
i would first check the timing and if that does not fit i would take the cover back off and look at the belt for a bad or missing tooth
Posted on Feb 14, 2009
check to see if there is any carbon on the throttle body where the butterfly contacts it. also clean the " business end" of the idle air valve to make sure it's not being held open slightly.
Posted on Feb 26, 2009
In order to resolve this problem you are going to need a different set of plugs even though the smart parts store mechanics say the computer says you need whatever plugs they want to sell you, you need to go with your OEM plugs if not sure call your local dealer and ask the parts dept. what is the name brand and specific length plug you need for your car when a plug is either too short or too long it will cause this problem if they say you have the correct ones then I would check the firing order to ensure the spark plug wires haven't been improperly installed meaning the firing order is off. I noticed you said the plugs were dirty if that was the case and plugs and wires are correctly installed and proper plug then I would have the fuel injectors cleaned try using some lucas fuel cleaner and stabilizer. If you feel wally world put too much oil in check your dipstick on level ground it will let you know if that is the case I would immediately take the car into dealer and have them check the oil pump to ensure it isn't damaged from over working or caused any other damages in your engine take the estimate with explanation of what caused the problem from the dealer to the walmart service manager where you had the tune up done to start the claims process to have them foot the repair cost or for reimbursement and demand a refund .This should get you back up and running correctly. much success and good luck with this. Please Rate Me. And you can always ask me.
Posted on Apr 26, 2009
A little secret i found was first setting the timing with the car in gear with the idle screw backed out once i had it set to where the car idled great i would then turn the idle screw in till it barely touched Hope this helps you email@example.com
Posted on Sep 09, 2009
Testimonial: "Thanks will give it a try "
The carbon on the spark plugs and black smoke coming out the tailpipe means you are running rich. (Too much fuel) this can becaused by anything from a bad Mass Airflow Sensor to a stuck injector to a leaking Fuel Pressure Regulator to a bad Upstream Oxygen sensor.
First, you need to check fault codes to see what the computer says the problem is. I would not be pouring injector cleaner in your vehicle unless you are absolutely certain the the cleaner you are using is going to be compatible with your fuel system. I've seen a lot of fuel system damage as a result of that.
In 2005 Chevrolet Avalanch had two different 5.3L engines one was flex fuel and the other was not.
The 8th digit in your VIN will tell you which engine you have. if it is a "T" it is standard gasoline and if it is "Z" it is a flex fuel engine.
There are several Technical Service Bulletins (TSB's) issued by GM for the fuel systems on BOTH of these engines. Depending on your engine type and the codes retrieved from the Engine Control Module, these TSB's may or may not apply to your problem.
Posted on Dec 02, 2010
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