88 bronco help
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88 bronco help
Hey yall I have a 88 bronco with 680k miles on it. The engine is a 351 Windsor with an EFI system. My supervisor gave it to me for free after he couldnt figure out what was wrong with it. It sat and wouldn't start for a year with him. When I got it, One day it just up and started randomly and ran perfectly for a week. I changed the battery, fuel filter, and installed nickel sparkplugs to it. It cranks but wont turnover completely. I need help figuring out of its a compression, or fuel issue. Thanks very much !!!
Laughing Gas
Joined: May 2011
Posts: 855
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From: SoCal
How did it run when it "up and started"? A long shot guess is either coil or ignition control unit, maybe the distributor stater pickup. After 680K miles any of those could be suspect. Have you tried pulling any codes?
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88 bronco help
When it ran for a week everything literally ran perfect. It would turnover no problem and drive like a champ. When I was on the highway the last day it would lose compression and drop rpms to 1000 or less. I pumped the gas to keep the rpm up and for the truck not to turn off completely. When I parked it back at home I took the key out and the truck was still running so I popped open the hood and took the battery connectors off. Now it just wint fully turnover even though the engine is trying to.
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Joined: Mar 2017
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From: Las Vegas
It needs Air Fuel and Spark to run. Stayed running is a wiring concern or electrical
What's the engine oil smell like and look like ? Is there a strong fuel smell ?
Is there fuel psi at the rail when cranking and turning over
How's the spark when cranking ? Coil or ignition control unit and stater problems are common
Whats the air intake system like.
Sounds like a Diag flow chart and some time is needed
What's the engine oil smell like and look like ? Is there a strong fuel smell ?
Is there fuel psi at the rail when cranking and turning over
How's the spark when cranking ? Coil or ignition control unit and stater problems are common
Whats the air intake system like.
Sounds like a Diag flow chart and some time is needed
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88 bronco help
The oil is good and I added an oil treatment to it as well. The spark sounds strong when the engine is trying to turnover; the engine just cant turnover completely. There is no fuel smell and the psi looked good to me as well.
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Senior User
Joined: Aug 2013
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From: Peoria IL
Sounds like a fuel pump - or fuel pump solinoid. Fuel pumps from that era tend to just stop & then not stop.
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88 bronco help
Update, i got a new battery, and air intake a couple days ago. I checked the starter relay, the fuel railings for pressure, and tried starter fluid today. It is most likely a spark problem and it is 30 degrees outside so that's not helping. The starter fluid got it to start for 2-3 seconds and it would cut off.
Last edited by BOOKIEXD; Feb 19, 2020 at 07:38 PM. Reason: 88 bronco help
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