No pulse at the Injectors.HELP
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No pulse at the Injectors.HELP
I am still trying to get the 1988 corvette TPI in my 1966 Nova running.Got the new TPI ECM Chip installed but still will not run.Ran the test with the Noid Light and there is no pulse.At a loss.Any help would be appreciated.Tried 2 different Distributors(TPI LARGE Cap)Still nothing.Have good fire at the plugs but not to the injectors.
#2
Drifting
The most common mistake made in a conversion is not connecting the pnk/blk wire to a Hot While Cranking source. I recommend the coil circuit. If you have this correct, are you sure you're running a no VATS chip?
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Just got a new Chip from TPIS Specialties Thursday and VATS was removed i hope.Have someone coming over next week with a Scanner so i hope we can find something.
Last edited by wagontrainer; 09-14-2013 at 10:33 AM.
#4
Drifting
There's only two wires that power the ECM. There's an orange wire that must be hot at all times, and the pnk/blk that's key on and hot while cranking. As long as you have those hooked up correctly, and VATS programmed out of the chip it should pulse the injectors. The ECM must see an ignition pulse prior to allowing injectors to fire, so if you have a fault there it could cause this condition. If you tried different distributors that is most likely eliminated.
If TPiS provided your chip most likely you should be good to go.
If TPiS provided your chip most likely you should be good to go.
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There's only two wires that power the ECM. There's an orange wire that must be hot at all times, and the pnk/blk that's key on and hot while cranking. As long as you have those hooked up correctly, and VATS programmed out of the chip it should pulse the injectors. The ECM must see an ignition pulse prior to allowing injectors to fire, so if you have a fault there it could cause this condition. If you tried different distributors that is most likely eliminated.
If TPiS provided your chip most likely you should be good to go.
If TPiS provided your chip most likely you should be good to go.
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P.S Where would you suggest i hook this up to?I believe all my Start On switch circuits are used right now.Would it be pulling too much current if i connected both the Distributor and the Computor wire(pink)to the same outlet at the bulk head connector?Could i somehow hook up a relay and run both from there?
Last edited by wagontrainer; 09-15-2013 at 09:18 AM.
#8
Drifting
Mine's been connected into my coil circuit for over 10 years. The orange wire is where the power comes from, and the pnk/blk just says it time to join the parade.
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I believe that is where the Distributor is hooked up on mine.I will try it there also.Sounds good,will keep you informed,and thanks again,Mark
#10
Race Director
You need two inputs for the injectors to pulse.
One is from the VATS module, which supplies a 30 Hz square wave. If you don't have a VATS system, there are aftermarket modules you can buy to simulate this signal.
The ECM also requires DRPs (Distributor Reference Pulses). These come from the ignition module in the distributor and they tell the ECM that the engine is rotating (either cranking or running). The ECM uses the DRPs to synchronize the injector pulses to the rotation of the engine.
One other aspect of DRPs is that the ECM turns on the fuel pump when it sees DRPs. That's to prevent the fuel pump from running if the ignition is turned on but the engine is not started.
One is from the VATS module, which supplies a 30 Hz square wave. If you don't have a VATS system, there are aftermarket modules you can buy to simulate this signal.
The ECM also requires DRPs (Distributor Reference Pulses). These come from the ignition module in the distributor and they tell the ECM that the engine is rotating (either cranking or running). The ECM uses the DRPs to synchronize the injector pulses to the rotation of the engine.
One other aspect of DRPs is that the ECM turns on the fuel pump when it sees DRPs. That's to prevent the fuel pump from running if the ignition is turned on but the engine is not started.
Last edited by Cliff Harris; 09-18-2013 at 01:56 AM. Reason: Added missing letter to word.
#11
Drifting
You need two inputs for the injectors to pulse.
One is from the VATS module, which supplies a 30 Hz square wave. If you don't have a VATS system, there are aftermarket modules you can buy to simulate this signal.
The ECM also requires DRPs (Distributor Reference Pulses). These come from the ignition module in the distributor and the tell the ECM that the engine is rotating (either cranking or running). The ECM uses the DRPs to synchronize the injector pulses to the rotation of the engine.
One other aspect of DRPs is that the ECM turns on the fuel pump when it sees DRPs. That's to prevent the fuel pump from running if the ignition is turned on but the engine is not started.
One is from the VATS module, which supplies a 30 Hz square wave. If you don't have a VATS system, there are aftermarket modules you can buy to simulate this signal.
The ECM also requires DRPs (Distributor Reference Pulses). These come from the ignition module in the distributor and the tell the ECM that the engine is rotating (either cranking or running). The ECM uses the DRPs to synchronize the injector pulses to the rotation of the engine.
One other aspect of DRPs is that the ECM turns on the fuel pump when it sees DRPs. That's to prevent the fuel pump from running if the ignition is turned on but the engine is not started.
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MrWillys i did as you suggested and checked my wiring and you were right.Had it hooked to a Switch ON power/No power while starting.Got it running but it ran terrible.Finally got it to idle fair and set the timing at 10 degrees.Ran like a plug was fouled so i checked the plugs and a couple had a little carbon on them.Cleaned them and put them back in,but ran the same.A friend of mine said to clean the MAF with some Brake Cleaner and a little compressed air.Also said to check the Fuel pressure and try some Fuel injection cleaner.Do you have any suggestions?I was hoping for a good smooth running engine.
#13
Team Owner
Why use brake cleaner? I wouldn't. I would use MAF cleaner. Also I am not sure about the compressed air thing. I would spray MAF cleaner and go with that since it is designed for it. I would be too afraid of using too much pressure and breaking the wire. Try this, remove the harness to the MAF and see if it runs better.
I'd check fuel pressure and make sure that after shutdown, it holds the pressure for a while. Also make sure that the filters are not clogged. You might have to take out the tank pump to see if the sock is clogged.
Also, I would check all the hoses for air leaks. How are the plug wires? Have you misted water AROUND them in a dark garage to check for plug wire leaks?
PS, I would forget the injection cleaner. IF you really think the injectors are bad, I would just toss them and get Bosch III injectors from FIC and be done with it. In fact, I would do it since your stock Multec injectors are not the greatest.
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Will be there in the Nova or the Wifes Altima one way or the other.
About to do the Pressure Test shortly will let you know how it does.Thanks for the info. Mark
#18
Drifting
Just relax and take it one step at a time. I've always said, the real work doesn't start until you turn the key. Take your time and you will get what you want. Is your timing at 6 degrees? Call me at 775-530-5892 if you'd like to discuss.
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I will try calling you sometimes today. Thanks Mark