1G no spark/ no injector pulse

[bearTSI91]

alright check it out..i have a 1991 talon tsi all stock..i bought it from this dude for 300 bucks. everything is there and complete but has been sitting since 98..it was his nephews or some shit who went to another country..anyway i brought it home cleaned it up and all the other good stuff..the car is not getting any spark and there is no injector pulse..im thinkin ecu but im new to these cars and wanted more opinions..thanks

 

[jastermerrel]

ECU seems to be the common culprit for this kind of problem on 1g's. Pull the ecu, open the cover, and look to see if any of the capacitors have leaked. There is a vfaq on fixing it I believe.

 

[larsenracing]

ECU seems to be the common culprit for this kind of problem on 1g's. Pull the ecu, open the cover, and look to see if any of the capacitors have leaked. There is a vfaq on fixing it I believe.

This is exactly what I have seen to.

 

[JessesTalon]

Well you can always swap in a known good ecu for a few minutes to see if that is the case.....

I wouldn't recommend buying a ecu unless you know its the problem for sure thouhg, all the injectors could be bad from sitting for 8 years....

Also check for corrosion in the electrical. texas uses salt on roads dont they?

 

[robs90tsi]

Change the injectors, plugs, wires, I'm assuming the vehicle cranks over, and all your electrical connections, I'm sure you're bound to find something bad, if its been sitting since 98. Possibly everything is clogged in your fuel system, I'd replace the pump, filter (definately the filter), check for fuel pressure, hell, you might even want to replace the lines. You might as well go with a Slowboy racing ss fuel line kit and a Wally 190 or somthing like that.

 

[bearTSI91]

where can i find an ecu to borrow..nodody around here has an awd talon

 

[bearTSI91]

oh and by the way i put a new fuel pump, filter and had the gas tank dipped and cleaned..the lines dont seem to be clogged because i have fuel all the way up to the rail

 

[Old Mitsu Tech]

Remember, if you have no spark, you will have no injector pulse. It could be the CAS also. It's a 50-50 toss on that one though. Both are very popular for failure.

Like some service manuals suggest, "replace with known good component" This is kind of a field test. I have an extra CAS just in case I have a failure. I will also have an extra PCM for the same reason.

Good Luck

 

[bearTSI91]

Remember, if you have no spark, you will have no injector pulse. It could be the CAS also. It's a 50-50 toss on that one though. Both are very popular for failure.

Like some service manuals suggest, "replace with known good component" This is kind of a field test. I have an extra CAS just in case I have a failure. I will also have an extra PCM for the same reason.

Good Luck

could it be the ignition switch??

 

[Old Mitsu Tech]

That would be easy to test. Take a test light and probe one of the injector wires. If it lights up and it won't run, I probably would rule out the ignition switch as it sends 12 volts to the injectors also.

 

[Mr4G]

Sounds like the ecu went bad.

 

[1991GSXAWD]

Remember, if you have no spark, you will have no injector pulse. It could be the CAS also. It's a 50-50 toss on that one though. Both are very popular for failure.
Good Luck

what he said

 

[bearTSI91]

alright guys thanks for the input

 

[bearTSI91]

one more thing the CAS is the crank sensor right? how much does it cost and how hard is it to replace

 

[bearTSI91]

i pulled the ecu out and it has this discoloration on the outside from moisture or somethin..this is south texas where humidity is 100% all the time..

 

[TJGoSurf]

Unscrew those 4 bolts and look at the board. See if it looks like anything wet has been on the board.

 

[1991GSXAWD]

the cas is the cam sensor on passanger side of the head by valve cover, as far as the ecu you need to remove the 4 screws pull the cover and look for anything burnt or leaking caps.

 

[bearTSI91]

i have another question..i pluged my ecu back in with the 3 connectors that plug into it..there is still 3 under there that are just hanging..do they go to something?

 

[bearTSI91]

nobody knows where those connections go or what they are for?

 

[TJGoSurf]

Probably for the transmission control unit.

 

[femmeDSM]

Yeah, looks like that to me.... ^^^

Do you have an Automatic.....?

 

[bearTSI91]

ya its an auto...i didnt know that shit was seperate..this car blows

 

[bearTSI91]

but thank you for the replies

 

[bearTSI91]

installed new ecu and CAS car fired right up

 

[Spoolin4Ever]

Does the car still blow?