1994 3.9 won't run when warm
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1994 3.9 won't run when warm - 4/8/2008 7:37:23 PM
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crusing52
Posts: 12
Joined: 4/8/2008
Status: offline
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I have a 1994 Dakota 3.9. Here is a little history on the truck. It has 225000 miles. Six months ago the timing chain broke. I gave the engine a valve job replaced the push rods. Cleaned the intake, new timing set. yada yada. The machine was back on the road and almost as good as 1994. I got a bunch of fire wood and ran errands with it until January. Then it all began. Overtime the truck would start and it would Backfire.Just run like crap for a while. Then I'd turn the key off start it back up and presto. It ran fine. So being the procrastinator I am I ran it like this till last week. It just wouldn't clear up. So I gave it a full tune up. Cap, rotor, wires, plugs. Nothing, so I replaced Map AIC and inspected the distributor for play. While inspecting the distributor I found that when I reinstalled the EGR, the gasket wasn't seated properly. I bought a new gasket and replaced it. VROOM the old bugger started right up. Took it for a spin around the block. Shut it off in the driveway and now it starts and just rumbles right off. I'm stuck. I need some more ideas bounced of me. With all these problems I’ve never even seen the check engine light.
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RE: 1994 3.9 won't run when warm - 4/8/2008 7:56:01 PM
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hitandrun83
Posts: 48
Joined: 3/3/2007
Status: offline
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plugged catalic converter? feel any exaust out of the tailpipe? by any chance does the 94 have the timing chain tensoner on it? if not, ive learned the hard way, autozone has it, i'd get it. you didnt get to look at rod and main bearings either, right?
< Message edited by hitandrun83 -- 4/8/2008 8:04:34 PM >
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RE: 1994 3.9 won't run when warm - 4/8/2008 8:08:21 PM
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crusing52
Posts: 12
Joined: 4/8/2008
Status: offline
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Just went out and tried it again befor I go to bed. It started right up. Seems like when it is cald she runs like a beut. I can rev the crap out of it. Took it for a rige again runs great untill I shut if off. It seems like I have to wait for it to cool off again. Maybe I'll take the egr off and clean it. I don't know. I need to goto bed But I'll check back in the morning. comments please!!!
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RE: 1994 3.9 won't run when warm - 4/8/2008 8:09:09 PM
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crusing52
Posts: 12
Joined: 4/8/2008
Status: offline
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No on the chain tensoner
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RE: 1994 3.9 won't run when warm - 4/8/2008 8:29:15 PM
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hitandrun83
Posts: 48
Joined: 3/3/2007
Status: offline
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well as long as you didnt have slop on the chain, should be fine, my chain went out because of cataclic convertor, or atleast i think it did, when it's plugged it creates a back pressure in your exhast system. i guess a good way is to check if it is blowing gas out of the fuel intake, it should be sucking in the gas....if your out ridding it at night, park it, look underneath, see something glowing red hot? if you do, means it probably plugged and i wouldnt drive it until i got it fixed. I was driving down the road one day, noticed a car that appeared to have lights underneath, which turned out to be a plugged up catalic convertor. the teenagers didnt know that was the problem, just knew that it didnt want to start right and ran rougher than normal...that was the only time that ive ever seen something that hot.. what does the temp gauge read? could it be a bad temp sensor?
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