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what does the computer actually control? 200 1989

posted by  Frodo on  Mon Nov 11 09:13 CST 2002
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Hi, I can't answer all, but I will try to help.

1. ECU controlls engine only (Fuel input duration and spark timing) depending on several sensors in the engine / air / exhaust-circuit. Not possible to disturb from inside the car without pulling wires/fuses.

2. Don't know 740, but are there any need for grounding in fuse box? No high voltage and whole chassis is ground. Grounding points are everywhere.

3. Battery/ground? These heavy gauge wires might need a check somtimes.

4. No, fuel pump relay is controlled by ignition switch and ECU only. Switch with new / known good relay.

Braking/turning should not trouble the engine, but the brake servo is using wacuum from engine and can change the rpm for some seconds.

Sounds like you having wiring/grounding trouble. Check all wires/connectors/earthing from battery via engine to dashboard.





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New what does the computer actually control?
posted by  weezy  on Mon Nov 11 05:29 CST 2002 >


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