1988 Ford Bronco II Stalling - Engine


Question: the fuel pump comes on when i turn the key.but when i start it the rpm goes to 3000 then stalls.after a few tries it will run for a little while but the rpms go from 500 to 1500.the only way to keep it running is to keep my foot on the gas. any ideas?


 
Technican: Look for a major vacuum leak. Disconnect and block off the egr valve. Any change? Pinch off the hose to the brake booster. Any change? Does the check engine light stay on?
Owner: didn't solve the problem
Technican: Does the check engine light stay on? If it does check troublecodes. Check the idle speed motor. Block off the air passage and see if idle is normal or low enough to stall the engine. This will check the mechanical condition of the engine vs a computer controlled problem.
Owner: the check engine light doesn't come on and i took off the idle speed motor and cleaned it but still runs rough and pings. could it be a timing problem?
Technican: Yes it could be the timing. I would verify valve timimg by performing a compression check. And then check ignition timing. If you need assistance with these steps autozone.com has free vehicle repair guides. When does the engine ping? Pinging is usually caused by a lean fuel mixture, carbon buildup, timing, or insufficient egr flow.

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