89' 460 Studder problem
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Joined: Sep 2006
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From: Blacksburg, Va
89' 460 Studder problem
The truck has a pretty bad stumble/studder between say 900 and 1800rpm. it is most noticeable due to a loss of power and the shifter/4wd select lever spinning around/moving like crazy up in the cab. i cant hear the engine misfiring, all i feel is a power loss/studder and the shifters moving around.
it all started when i changed the o-rings on the #5 injector due to a leak. In the process, i managed to bend the pintle on the injector, and had to replace it with one from advance auto.
i have since switched back to a bosche blue top injector, replaced the dizzy cap and rotor, replaced the foward-most coolant temp sensor on the intake manifold, and the studder is still occurring.
I have pulled the spark plug on cylinder #5, and it looks alright (at least according to this site: http://dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html). It is neither soaked with fuel and really black, nor white and corroded.
i think this weekend im going to try to swap out all of the injectors with the new ones ive bought, to see if that makes any difference.
Any ideas anybody has would be much appreciated, im at my wits end with this problem. thanks!
-Drew
it all started when i changed the o-rings on the #5 injector due to a leak. In the process, i managed to bend the pintle on the injector, and had to replace it with one from advance auto.
i have since switched back to a bosche blue top injector, replaced the dizzy cap and rotor, replaced the foward-most coolant temp sensor on the intake manifold, and the studder is still occurring.
I have pulled the spark plug on cylinder #5, and it looks alright (at least according to this site: http://dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html). It is neither soaked with fuel and really black, nor white and corroded.
i think this weekend im going to try to swap out all of the injectors with the new ones ive bought, to see if that makes any difference.
Any ideas anybody has would be much appreciated, im at my wits end with this problem. thanks!
-Drew
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Joined: Nov 2001
Posts: 3,351
Likes: 1
From: Escondido, CA
Have you tried cleaning the throttle body and IAC valve? Sometimes they send a faulty signal to the computer if they are dirty. If the injector was faulty you would have the stumble throughout the entire rpm range. Your problem is only on the tip in of the throttle.
Last edited by airharley; Feb 20, 2007 at 06:50 PM. Reason: missing info
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Joined: Sep 2006
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From: Blacksburg, Va
well, whatever it is it seems to have gone away. i just did the cap, rotor, and changed the advance auto injector out for a bosch replacement today. after doing so i went on a ~45 min drive, and about half way through the drive the studder just up and went away. go figure.
hopefully it will still be gone when i go to drive it tomorrow morning.
thanks for the reply though!
hopefully it will still be gone when i go to drive it tomorrow morning.
thanks for the reply though!
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id_birdhntr
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Sep 24, 2012 04:03 PM
