Off Timing?? 1G

[DSMFLipp]

Looking at this talon near me. Seems he has ran all the usual tests.

I dont beleive this compression is good tho. Should it be that low? 130 amd 130 on two cylindrs does not look good too me!

What do you guys think is wrong with it? Im stumped.


1991 Talon TSI

 

[bryanwheat]

Check the timing marks than do a leakdown test.

 

[Tyeler18]

Looks perfectly normal for a tired motor. If timing was off the numbers would be way off.

 

[DSM1G90]

He talks about suddenly dying and no start ... wonder if the ECU took a dump. 130 is close to service limit but still operationable where it'll still run okey...

He'd better not want too much for a dead car.

 

[DSMFLipp]

He talks about suddenly dying and no start ... wonder if the ECU took a dump. 130 is close to service limit but still operationable where it'll still run okey...

He'd better not want too much for a dead car.

Thats what I was thinking. Bad ECU. I have one here I beleive.

My second thought would be the o rings on the injectors. I have had quite a few of them go bad or the injectors not seating properly, which caused all kinds of issues.

and is 130 still okay, but how far from service would you say?

Thinking if I go pick this car up, I would fix it and sell it for a higher price and keep looking.

 

[bryanwheat]

Thats what I was thinking. Bad ECU. I have one here I beleive.

My second thought would be the o rings on the injectors. I have had quite a few of them go bad or the injectors not seating properly, which caused all kinds of issues.

and is 130 still okay, but how far from service would you say?

Thinking if I go pick this car up, I would fix it and sell it for a higher price and keep looking.

Leaky injector isolators will not cause the car to die and not start. It is hard to tell why it does, there are a million reason's why.

 

[blizz99]

Would leaks from the injectors cause lower compression?

 

[bryanwheat]

Would leaks from the injectors cause lower compression?

Absolutely not.

 

[jb2zero0six5]

The service limit is 121. Did a BLT?

 

[jrohner]

Those compression numbers are OK. I'd see if it fires on carb cleaner to see if it's a fuel issue. Just because he says the fuel pump runs doesn't mean fuel is being injected into the engine. Unplug the airflow sensor and see if it starts.

 

[Tyeler18]

Those compression numbers are OK. I'd see if it fires on carb cleaner to see if it's a fuel issue. Just because he says the fuel pump runs doesn't mean fuel is being injected into the engine. Unplug the airflow sensor and see if it starts.

This exactly. My no start was from the fuel pump oring missing and losing pressure. I had fuel to the rail but not enough. Also we've had 2 1gs with 100psi compression still going strong on their 16gs and boosting daily.

 

[DSMFLipp]

Those compression numbers are OK. I'd see if it fires on carb cleaner to see if it's a fuel issue. Just because he says the fuel pump runs doesn't mean fuel is being injected into the engine. Unplug the airflow sensor and see if it starts.

This would be the first thing I would of done upon getting to the car. Thats if the timing marks are on. Which Im sure they are.


I was thinking a fuel issue also. Was already planning on bringing carb cleaner.

Why unplug the airflow sensor though? Thinking its bad?

What if the cam position sensor was bad? throwing off the ECU on when to spark cylinder number one?

 

[DSM1G90]

To test fuel pump: above the fuel filter in the harness is a small connector that you put a jumper wire in. (you actually will see two small connectors in that area of the harness about a foot apart from one another. You use the left one - closest to the passenger side)

The other end of the wire is were you touch the positive of the battery.

This is a bypass wire connection direct to fuel pump.

You squeeze the fuel line as you do this battery touch.

If you feel pressure build up in the line, pump's okey.

-DSM

 

[Tyeler18]

To test fuel pump: above the fuel filter in the harness is a small connector that you put a jumper wire in. (you actually will see two small connectors in that area of the harness about a foot apart from one another. You use the left one - closest to the passenger side)

The other end of the wire is were you touch the positive of the battery.

This is a bypass wire connection direct to fuel pump.

You squeeze the fuel line as you do this battery touch.

If you feel pressure build up in the line, pump's okey.

-DSM

Yes and no. 20 psi of fuel pressure will FEEL and LOOK like 40psi of pressure, however, 20 psi is not enough to start on. My no start was from the o-ring in the pump being missing. When I'd pull the feed line off the rail and kick the pump on fuel would come GUSHING out, so I assumed I had plenty of fuel in the rail. Well, it definitely wasn't enough. Pulled the pump, fixed it and went from 18psi at the rail to it firing up and running (didn't check pressure afterwards).

 

[DSMFLipp]

My buddy actually ended up buying this car. Turned out to be a bad ground and a few other issues. Car was slightly off timing. Internals were fine. She is now up and runing great. Thanks guys!