Secondaries Not Firing
#1
88 GXL auto to manual.
Problem started a little over a week ago.. I'd hit the secondary transition at 3,800 revs and I'd go through the windscreen like hitting fuel cut. Now it is permanent. My idle quality has also severely deteriorated since this started happening consistently.
- injectors were serviced last year and flowed well before and after.
- my engine is grounded extremely well.
- no pins are getting pushed back in their plugs.
- getting a 12v signal with ignition on to secondary plugs.
- tps is adjusted
- pretty confident no vacuum leaks exist.
At a point of frustration with searching I suppose. Need some input. Part of me has suspected the health of the ecu for about a year now. With all of the adjustments and tinkering...in six FCs, I've never had an issue getting the engine to run and idle just right. This could be wiring related, of course. My mileage is also worse than any fc I've owned.. 12 - 15 mpg.. regardless of what I do. That in itself has been confuzzling me as all of my previous FCs averaged 21 mixed driving. All of them, every time.
Problem started a little over a week ago.. I'd hit the secondary transition at 3,800 revs and I'd go through the windscreen like hitting fuel cut. Now it is permanent. My idle quality has also severely deteriorated since this started happening consistently.
- injectors were serviced last year and flowed well before and after.
- my engine is grounded extremely well.
- no pins are getting pushed back in their plugs.
- getting a 12v signal with ignition on to secondary plugs.
- tps is adjusted
- pretty confident no vacuum leaks exist.
At a point of frustration with searching I suppose. Need some input. Part of me has suspected the health of the ecu for about a year now. With all of the adjustments and tinkering...in six FCs, I've never had an issue getting the engine to run and idle just right. This could be wiring related, of course. My mileage is also worse than any fc I've owned.. 12 - 15 mpg.. regardless of what I do. That in itself has been confuzzling me as all of my previous FCs averaged 21 mixed driving. All of them, every time.
#3
Update:
Smallest ecu connector, took the dmm to it.
Ignition on, rear rotor secondary gets 12.5 volts.. front rotor is only seeing 10.5 out of the ecu. Voltage drops off significantly when driving at the secondary stage.. i did notice that after the secondaries were triggered and i was back down to idle, I was reading closer to 14volts instead of 12. Cycled the ignition and it went back to 12.
I have checked resistance between the ecu and the injector clips and there is 0.03 between the ecu and the injectors. Continuity, obviously.
Rear rotor secondary injector ohmed fine.. cannot get a reading from the front rotor's secondary injector.. probably bad and causing my problem ?
Smallest ecu connector, took the dmm to it.
Ignition on, rear rotor secondary gets 12.5 volts.. front rotor is only seeing 10.5 out of the ecu. Voltage drops off significantly when driving at the secondary stage.. i did notice that after the secondaries were triggered and i was back down to idle, I was reading closer to 14volts instead of 12. Cycled the ignition and it went back to 12.
I have checked resistance between the ecu and the injector clips and there is 0.03 between the ecu and the injectors. Continuity, obviously.
Rear rotor secondary injector ohmed fine.. cannot get a reading from the front rotor's secondary injector.. probably bad and causing my problem ?
Thread
Thread Starter
Forum
Replies
Last Post
LongDuck
1st Generation Specific (1979-1985)
12
10-07-15 08:12 PM
eplusz
General Rotary Tech Support
15
10-07-15 04:04 PM
ls1swap
3rd Generation Specific (1993-2002)
12
10-01-15 07:58 PM