|
|
Re: Ignition Timing
[Re: poorboy]
#3025878
03/20/22 09:48 PM
03/20/22 09:48 PM
|
Joined: Jan 2003
Posts: 18,428
UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 18,428
UPPER MICHIGAN, MARQUETTE COUN...
|
An 89 3.9 in a Dakota could be either EFI or carbed. (the EFI may have been an option, or possibly state controlled/required I believe). I'm not sure you could still change the timing by turning the distributor in an 89 or not. If you could change the timing by turning the dist, pinging would be the concern with advancing it too far. Lots more things involved with then a simple set the timing at a specific number and call it good, it has to be advanced dependent on each truck, and each driver could also effect the timing advancement.
A 1990 Dakota 3.9 was all throttle body EFI and computer controlled. 87 was the last year for a carburetor. 88 was throttle body EFI. Timing was all fixed through the ECM. Moving the distributor does nothing per say as far as changing the timing. It changes the reference signal to the ECM and the ECM uses other signals to adjust and control the complete fuel and timing events.
|
|
|
Re: Ignition Timing
[Re: Crosshairs]
#3027777
03/26/22 02:36 PM
03/26/22 02:36 PM
|
Joined: Jan 2021
Posts: 1,018
rust belt
Moparite
super stock
|
super stock
Joined: Jan 2021
Posts: 1,018
rust belt
|
Timing was all fixed through the ECM. Not so! It still has a distributor and can be moved to change the timing. IF it had a crank sensor and a cam sensor(found in the distributor) then it would be "fixed". The ecu can change the setting to a degree so you have to disconnect the coolant temp sensor(after the engine is at operating temp). The actual timing degree should be on the emissions label in the engine compartment so you can adjust it with a timing light.
|
|
|
Re: Ignition Timing
[Re: Moparite]
#3027788
03/26/22 03:32 PM
03/26/22 03:32 PM
|
Joined: Jan 2003
Posts: 18,428
UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 18,428
UPPER MICHIGAN, MARQUETTE COUN...
|
Timing was all fixed through the ECM. Not so! It still has a distributor and can be moved to change the timing. IF it had a crank sensor and a cam sensor(found in the distributor) then it would be "fixed". The ecu can change the setting to a degree so you have to disconnect the coolant temp sensor(after the engine is at operating temp). The actual timing degree should be on the emissions label in the engine compartment so you can adjust it with a timing light. The base timing needs to be correctly set. The ECM takes over from there and does all advancing and fuel management. All that is in the distributor is a magnetic trigger no moving parts. Having the base timing under or over advanced from the recommended setting can cause erratic drive ability issues. Just read the manual for a better understanding.
|
|
|
|
|
|
|
