1989 Dodge Ram B250 Computer
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Joined: Nov 2012
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From: Calgary
1989 Dodge Ram B250 Computer
Where is the computer on a 1989 Dodge Ram 250 318 cu? My check engine light must be burned out since it doesn't light up to give me any codes.
I'm trying the determine the cause of what feels like an electronic 'miss' but after replacing plugs, wires, coil, distributer (and fuel filter for good measure) I'm still stumped.
When it starts cold if runs fine for a few seconds then dies. If you keep it running by giving gas and the engine warms up it will idle. If you try to drive it cold, it stumbles and runs very rough. Under agressive acceleration it performs ok. And once warmed up the problem seems to disappear.
It was suggested to me that it is the throttle position sensor? Knowing where the computer module is would be helful along with any other advice.
I'm trying the determine the cause of what feels like an electronic 'miss' but after replacing plugs, wires, coil, distributer (and fuel filter for good measure) I'm still stumped.
When it starts cold if runs fine for a few seconds then dies. If you keep it running by giving gas and the engine warms up it will idle. If you try to drive it cold, it stumbles and runs very rough. Under agressive acceleration it performs ok. And once warmed up the problem seems to disappear.
It was suggested to me that it is the throttle position sensor? Knowing where the computer module is would be helful along with any other advice.
Record Breaker
Joined: May 2008
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From: North TX
Most of our van's PCM's are on the firewall above the engine. You should find some electrical wires and on yours I think a vacuum line going to it. If not there then check on the drvers side fender well beside the battery.
Record Breaker
Joined: Aug 2007
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The computer is located as stated above.
No vacuum line going to it, but there is a smaller diameter hose from the main cold air tube to feed it fresh air.
Disconnect the battery and remove the connectors on the computer and inspect closely for corrosion, black or green or white.
Inspect the wires where they enter the connector, especially on the 14 pin connector. The 14 wire connector has given me many issues over the years and is always my first suspect when something electrical is not right.
Replace the check engine bulb, and check for codes via the "Key dance"
The 2 wire coolant temp sensor next to the upper radiator hose outlet would be my first check/ replacement with what you describe.
A haynes or chilton manual will show you how to test all the sensors so you don't just start throwing parts at the problem.
A factory service manual, sold on e bay motors, is even better.
No vacuum line going to it, but there is a smaller diameter hose from the main cold air tube to feed it fresh air.
Disconnect the battery and remove the connectors on the computer and inspect closely for corrosion, black or green or white.
Inspect the wires where they enter the connector, especially on the 14 pin connector. The 14 wire connector has given me many issues over the years and is always my first suspect when something electrical is not right.
Replace the check engine bulb, and check for codes via the "Key dance"
The 2 wire coolant temp sensor next to the upper radiator hose outlet would be my first check/ replacement with what you describe.
A haynes or chilton manual will show you how to test all the sensors so you don't just start throwing parts at the problem.
A factory service manual, sold on e bay motors, is even better.
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Registered User
Joined: Nov 2012
Posts: 8
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From: Calgary
1989 Dodge Ram 250 misses
Boy do I feel stupid. The check engine light is behind where I mounted my iPod. Doing the "dance" I get fault code 15 which is "no speed sensor signal" on the chart. The problem seems to be worse when the temperature is below freezing. Rough idle when the engine is cold and then when driven it feels like the engine is cutting out....worse than a miss but it is intermittent. ??????