cold engine stumble
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Junior User
Joined: Apr 2005
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From: durham bridge n.b., canad
cold engine stumble
My 1994 Bronco 5.8 Auto stumbles when the engine is cold. It starts up fine and runs great for about 2 minutets then it starts to die, RPM's drop off & pick up, drop off & pick up until engine dies. When you drive it it acts like a carburated engine without a choke until it warms up. After warm up it runs great. When cold and acting bad the "check engine" light is on. After warm up the light is out. Bill Hanson.
Elder User
Joined: Feb 2005
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From: Hoboken, NJ...
Have you checked for codes??? I am 99% sure if your getting a CEL (even if it goes back out) you will have a stored code. If you dont have a scanner, you can get your codes read at Auto Zone or a place like that for free!
Senior User
Joined: Nov 2002
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From: Kelso,WA
You can buy a code reader for your Bronco @ just about any auto parts store for about $35-40. This little jewel will pay for itself at least 3 times over in it's very 1st use. Also you'll want a haynes manual for about $20-30. With a little bit of reading you'll be amazed at the money you'll save. I'll never look back, best money I've ever spent on any vehicle.
Cargo Master
Joined: Apr 2002
Posts: 3,027
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From: Manchester, CT USA
My '93 is doing basicly the same thing but doesen't die. Also if I get on it too soon it stumbles backfires and has no power. If you find a code reader tell me where you got it and it's brand name so I can find one here in CT. Thanks
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From: Eglin AFB
i think in both cases it is time for a tune up and you dont need to buy a code reader. you can get a haynes manual and it will tell you how to do it with a paperclip. if you want to buy a code reader go for it, I did but it was on sale at wal mart for 10 bucks so i couldnt beat the price.
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Joined: Nov 2002
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From: Kelso,WA
I got mine @ Schuck's Auto for $35 but that was about 5yrs. ago so they may be a little more now. At any rate the brand is (Innova Electronics Corporation)aka. (IEC) It comes with detailed info on how to use it. However you will need a manual to learn more about each code you pull up. Unless they have gotten better books for the reader. GOOD LUCK!
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Senior User
Joined: Nov 2002
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From: Kelso,WA
Fixing what would otherwise be a possible nightmare
If you still cannot diagnose the problem after pulling the codes, doing a tune up or cleaning out your throttle body which does not pull a code but can cause the computer to foul up. It may need a new computer. The only reason I say this is because my computer went bad about 2yrs. ago but sent no trouble codes. And it was idling irratically plus bucking when giving fuel but this is only if all else shows up normal. You may be able to pick a computer up anywhere from a knowledgable wrecking yard to a dealership to a parts store for anywhere between $50-250. I bought mine from the local wrecking yard from a person whom I knew I could trust for $75. They must match up the new used one with your old ones numbers. These model numbers on the computer represent things like Auto trans, air conditioning etc.
By the way my Bronco has Nearly a Quarter of a million miles. Hope this helps (TOMMANJBO) again best of luck!
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By the way my Bronco has Nearly a Quarter of a million miles. Hope this helps (TOMMANJBO) again best of luck!
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Last edited by adamk1974; Jan 4, 2006 at 02:33 AM. Reason: typo
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Cargo Master
Joined: Apr 2002
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From: Manchester, CT USA
I found that the coolant was low so I added what I had left (about a quart)and water (about 3 quarts) then the problems began. I checked it again it was low again so I put in about 2 quarts of straight coolant in and now it's fine again. I think the throttle body was getting semi-frozen and the computer was choking the motor and running it too rich and flooding it. Now I keep a better eye on the coolant level. Thanks,
Justin
Justin
Elder User
Joined: Jan 2005
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From: Houston
Just a word of advice. If you take it to Autozone and get them to read the codes, don't just buy the first thing he says is broke. bring back the codes to us and post them. we may be able to help you decide what the problem is.
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Junior User
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From: durham bridge n.b., canad
Thanks to all for your advice. I baught a code reader for about $50.00, which told me that I had a bad oxygen sensor. I baught one for about $100.00 & replaced it myself, and that solved the problem. The Bronco runs fine now. Bill Hanson.
Elder User
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From: Hoboken, NJ...
Originally Posted by Bill Hanson
Thanks to all for your advice. I baught a code reader for about $50.00, which told me that I had a bad oxygen sensor. I baught one for about $100.00 & replaced it myself, and that solved the problem. The Bronco runs fine now. Bill Hanson.