Resolved 1G Crank no start

[Mikey_Dsm]

So I just finished rebuilding the engine and got all the connectors put together all correct from what I could tell. I’ve primed the oil pump and put fresh gas in the car.

I’ve got crank and no start and I’ve got no idea what it could be, I’m more of a 2g guy so this is new territory for me. Any ideas what it could be?

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[pauleyman]

What have you checked? Ecu powering up? Got fuel? Spark? Just crank no start is pretty vague. Could be 100 things. Give a baseline here if you have one.

 

[Mikey_Dsm]

What have you checked? Ecu powering up? Got fuel? Spark? Just crank no start is pretty vague. Could be 100 things. Give a baseline here if you have one.

Sorry that's my bad.

I’ve made sure timing is solid with the CAS and everything is good there and In time, I just gotta dial it in with a timing light.

I’ve got two ECU’s I tried and that didn’t work but I know the ECU is powering up. I haven’t checked the fuel rail to see if it’s got fuel pressure but the fuel pump works. I also haven’t checked its condition yet if to see it looks like it’s 30 years old.

And then I haven’t checked to see if it’s got spark so I will do so tomorrow morning. I’ve got BPR6ES and gapped to .026, and it’s got a new battery.

My first time really diagnosing a crank no start but I’ve got a good idea on what to do and want some pointers on where to look.

 

[steve]

That battery doesn't sound too healthy even being new. Put it on the charger.
I can see the boost gauge doing normal things but the tach doesn't move at all, that could be a clue.

What's the compression like since you have rebuilt the engine?

Do you have ECMLink installed now and if so could you post a log of it, starting with before you try cranking it so we can see the baseline sensor values then cranking.

 

[pauleyman]

That battery doesn't sound too healthy even being new. Put it on the charger.
I can see the boost gauge doing normal things but the tach doesn't move at all, that could be a clue.

What's the compression like since you have rebuilt the engine?

Do you have ECMLink installed now and if so could you post a log of it, starting with before you try cranking it so we can see the baseline sensor values then cranking.

Tach not moving is a clue. My 1g lost an ignition transistor once. I had a spare. Bad one tach didn't move. Good one tach twitches and car starts. Good place to look.

 

[Mikey_Dsm]

That battery doesn't sound too healthy even being new. Put it on the charger.
I can see the boost gauge doing normal things but the tach doesn't move at all, that could be a clue.

What's the compression like since you have rebuilt the engine?

Do you have ECMLink installed now and if so could you post a log of it, starting with before you try cranking it so we can see the baseline sensor values then cranking.

Haven’t had the chance to break it in but will check compression to see what it is.
I just ordered a new cable since I lost my old one so when that arrives I’ll post a log.

Tach not moving is a clue. My 1g lost an ignition transistor once. I had a spare. Bad one tach didn't move. Good one tach twitches and car starts. Good place to look.

ill look around and see if I have a spare or if anyone in my area has one to check that off

 

[pauleyman]

Haven’t had the chance to break it in but will check compression to see what it is.
I just ordered a new cable since I lost my old one so when that arrives I’ll post a log.

ill look around and see if I have a spare or if anyone in my area has one to check that off

Check the harness first and make sure it's plugged in well.

 

[1990TSIAWDTALON]

The 1990 models use a different PTU than other DSM'S. It's a J122 and is marked on the part, in the center. Check to make sure you have the proper PTU, if this is for the 90 Laser. You should be able to read it without unbolting it.

 

[Mikey_Dsm]

The 1990 models use a different PTU than other DSM'S. It's a J122 and is marked on the part, in the center. Check to make sure you have the proper PTU, if this is for the 90 Laser. You should be able to read it without unbolting it.

I’ve got the correct PTU for the 90 laser model and it’s plugged in. Spark plug wire firing order is correct aswell

 

[pauleyman]

I’ve got the correct PTU for the 90 laser model and it’s plugged in. Spark plug wire firing order is correct aswell

Pull a wire and plug and verify you actually have spark. easy easy test.

 

[steve]

Another unique part of the 90 ignition system is the noise filter for the tachometer that is bolted to the intake manifold stay. Without it the tach signal from the coil pack doesn't reach tachometer.

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[Mikey_Dsm]

Thanks for the the help guys! It ended up being the PTU. verified spark and fuel pressure before changing it out.