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1994 gmc jimmy 4.3


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jsapp
New User

Nov 27, 2014, 7:19 AM

Post #1 of 6 (1185 views)
1994 gmc jimmy 4.3 Sign In

 will not start unless bumping starter, will not crank in starting position


(This post was edited by Hammer Time on Nov 27, 2014, 7:37 AM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 27, 2014, 7:39 AM

Post #2 of 6 (1173 views)
Re: 1994 gmc jimmy 4.3 Sign In

I moved your question out of the title line and into the body of the question box where it belongs.

You need to put a little more effort into your question so people can understand what's going on and what has been done to the vehicle previously.

What exactly does "bumping the starter" mean? Are you hitting the starter with something?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jsapp
New User

Nov 28, 2014, 12:41 PM

Post #3 of 6 (1140 views)
Re: 1994 gmc jimmy 4.3 Sign In

I am sorry I was not explaining myself very well. By bumping starter I mean turning the key from on to start and back repeatedly. It will crank after a few times of doing this and runs fine. First time posting to this site and did not know correct procedure to do so. I will try to be more specific in details in the future. Thank you for any assistance you can give.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 28, 2014, 1:25 PM

Post #4 of 6 (1131 views)
Re: 1994 gmc jimmy 4.3 Sign In

Fine - just a term not everyone would use for what you just explained. IMO and have witnesses that what you are doing is heating up a weak connection that finally when hot works or I should say chances are.


Tons of crap happens to vehicles of all sorts over connections, batteries, cables and the integrity thereof. All must be ruled out and you have the symptoms if I now read you accurately. Note: This more common with GM sideposts cables at battery than many others,


T



jsapp
New User

Nov 29, 2014, 5:37 AM

Post #5 of 6 (1114 views)
Re: 1994 gmc jimmy 4.3 Sign In

i ame getting fire at coil onstart and run .will not start-bump starter at switch a few times will run-runes fine. could it be fuel enrich mod.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 29, 2014, 5:58 AM

Post #6 of 6 (1109 views)
Re: 1994 gmc jimmy 4.3 Sign In

Hey - clarify what you are doing somehow. If it doesn't crank at all what would the point be of anything else? You must begin there or any testing will mess you up.


What you call "bump" start to me and your re-description is multiple tries to engage starter which is a HUGE draw on the battery. If that has only a tiny connection anywhere from battery on to it, it would be hot right there with even the slightest inadequate connection such that the heat with the multiple tries finally is just enough to crank. It won't keep doing that for you, you need to find that weak link. Testing anything when it totally behaves is futile so test when it's NOT cranking.


I'll guess you lack a lot of test equipment but advise if otherwise. You could simply look at an interior dome light that normally would be on while in "crank" mode, leave it on and watch it either dim drastically or even go out completely. If it goes out things like radio presets, clock and whatever will reset like you disconnected the battery without a memory saver.


Did you even check the side post terminals? You have to peel back the cover and probably shocked at how bad they are unseen while in place. This is common when much newer than this is. If those are NOT assertively greased up periodically it's really not a maybe but when they will fail. Simple as that much if only to prove they are good. Then move on if that's not it.


No cranking the testing is useless for something else,


T







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