Hi all new to the forum. Anyway i have a 97 two door yukon 5.7 with 4l60 4wd. When i leave a red light/ stop sign and accelerate my truck seems to shudder or miss, i have had it on my scan tool and it sometimes show a #6 misfire. I have replaced plugs, wires, cap, rotor, fuel filter, and fuel pump (pump went bad :-( ). I also noticed that when i unplug my TPS the shudder goes away, i have replaced the TPS with same end result still shudders while hooked up. Any suggestions? Its killing me makes my truck sound like crap.
97 yukon shudders on accel
- Thread starter firedog
- Start date
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SunlitComet
OBS Jedi-Do Good
if you used all ac delco parts you either have a cylinder injector going bad or a compression issue with that cylinder.
Disconnecting your tps puts the truck in a limp mode changing the fuel and ignition mapping which would mask your problem most likely.
---------- Post added at 11:47 AM ---------- Previous post was at 11:46 AM ----------
Also make sure you followed the proper spark wire routing layout to each cylinder. I am not talking about firing order.
Disconnecting your tps puts the truck in a limp mode changing the fuel and ignition mapping which would mask your problem most likely.
---------- Post added at 11:47 AM ---------- Previous post was at 11:46 AM ----------
Also make sure you followed the proper spark wire routing layout to each cylinder. I am not talking about firing order.
so, i put my scanner back on truck today and drove around the parking lot at work, had no active codes at the time, in a 200 revolution period #3 misfired 38 times, #6 misfired 3 times. So can i safely assume that replacing only the #3 injector will most likely fix this problem? I have checked and rechecked wires and routing ( i understand you didnt mean order). Havent check dist play but do not see it only affecting that one cylinder that much. The reason for only replacing the one injector is simply im broke, i do not have the $$$$ to replace the entire spider which is exactly what i would like to do.
SunlitComet
OBS Jedi-Do Good
Think about this. The originals can have an individual injector part replaced, costs about 65-75 each. plus a few for new bracket as you will bend the old one to get the body off. For about 215 you get a whole new spider the has eight new injectors and a new regulator as well as new bracket. The injectors have been moved out of the main body and put further downstream of the lines to put improved injectors on it. It has proven it self well for those who have switched. If you can, wait it out a little longer. Other injectors will follow after the first two. If it is an occasional MIL light blink then you can squeeke by a little longer. If your stop is at a red light then huetral the tranny for a moment to reduce the impact of misfire.
billy69tahoe
Member
mine was shuddering and i had it checked and my head gaskets were blown...might help
Here is a little note I found on replacing injectors.
Why you should replace all of your injectors at the same time.
All injectors receive the same signal from the ECU to either "open" or "close", and for how long to stay open. If you have a 6cyl vehicle and all the injectors are flowing different amounts of fuel, some cylinders will be running lean and some may be running too rich because they are getting one generic signal to all injectors. So.... If all 6 injectors are cleaned and flow tested to OEM specifications, they are going to be flowing the same amount of fuel. When the ECU tells the injectors to open or close, and for how long, then the engine and each cylinder is going to receive the correct amount of fuel because all 6 injectors are flowing the same amount of fuel.
On the contrary....If one injector is replaced (which flows to OEM specs) and the other 5 injectors are dirty, restricted, or just flowing a different amount than the "clean" one, you may get the same condition as described in the first scenario above. The remanufactured injector may be performing correctly, but it may not necessarily solve the problem.
For optimum performance and efficiency, all injectors must flow the same amount of fuel, and have good atomization of the fuel droplets.
Why you should replace all of your injectors at the same time.
All injectors receive the same signal from the ECU to either "open" or "close", and for how long to stay open. If you have a 6cyl vehicle and all the injectors are flowing different amounts of fuel, some cylinders will be running lean and some may be running too rich because they are getting one generic signal to all injectors. So.... If all 6 injectors are cleaned and flow tested to OEM specifications, they are going to be flowing the same amount of fuel. When the ECU tells the injectors to open or close, and for how long, then the engine and each cylinder is going to receive the correct amount of fuel because all 6 injectors are flowing the same amount of fuel.
On the contrary....If one injector is replaced (which flows to OEM specs) and the other 5 injectors are dirty, restricted, or just flowing a different amount than the "clean" one, you may get the same condition as described in the first scenario above. The remanufactured injector may be performing correctly, but it may not necessarily solve the problem.
For optimum performance and efficiency, all injectors must flow the same amount of fuel, and have good atomization of the fuel droplets.
noJeepshere
Full Access Member
Mine stuttered and stumbled under similar circumstances, light throttle low speed, it would fall on it's face until I got into the throttle, then all was grand. Turns out it was the egr valve sticking open, feeding smoky exhaust gases to the motor when it shouldn't be.
crows feet
Member
thats what i was gona say .unplug egr tube,if stops skipping,how i found mine,just cleamed mine,2.50 for egr gasket and some sand papper,,,,,
noJeepshere
Full Access Member
How did you clean it? I tried brake cleaner. Maybe something like carb cleaner?
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