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quidditchfan
New User
Jul 22, 2010, 8:54 PM
Post #1 of 2
(2066 views)
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98 Jimmy stalling
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I'm having a very unsual problem with my 1998 GMC Jimmy (4.3 L Vortec) and I cannot figure it out. The vehicle was running fine and then I went througha puddle that was deeper than I thought. After coming out of the puddle, in which the underside of the vehicle was submerged the Jimmy ran fine for about 15-20 min and then began bogging. In normal running it will idle at around 600-800 rpm however as it began doing this the rpms will drop below 400 and then will die. If I wait a moment sometimes it will crank but the moment I put it in gear it will bogdown and die OR as I apply pressure to the accelerator it will jump forward a few times and then die. I initially thought I had water in something so I let it sit for more than 24 hours before starting it again. It ran fine for about 15 mins and then it began doing the same jumping forward/bogging down thing again. I'm really confused here.
I checked the fuel pump and it appears to be fine as is the fuel filter. The engine is new, full engine replacement about 2 months ago so all new plugs, wires, distributor cap, valves, tranny, rear end, etc, etc, etc. I'm wondering if I have water in a wire somewhere but just not sure where to start looking. I'm not the best mechanic in the world but I'm passable with good direction. My brother is the mechanic but he won't be able to look at it for awhile and frankly he's done enough for me with this thing. Anything that anyone can offer would help! Thanks
(This post was edited by quidditchfan on Jul 23, 2010, 8:23 AM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 23, 2010, 8:37 AM
Post #2 of 2
(2056 views)
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Re: 98 Jimmy stalling
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There should be a code waiting even if the check engine light isn't on yet. Hard to say what took the worst hit from water, ran fine for while then acted up. Connector plugs to about anything low enough to be submerged could have sucked up water. This should have sensors for trans, O2s, and connections for fuel pump have been a trouble spot anyway.
IDK - I'd probably check all the low connections and let dry if wet and a Q-Tip drop of WD-40 may help. Remember a code will likely suggest which area isn't right and won't know if the part is bad or connection confusing it OR hot O2 sensors suddenly shocked by cool water could have plain broken??
T
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