Crank but no start

Hi all,
New to here and my first post. its agreat site you have here . have read many post b4 writing this post and gained some understanding of where to trouble shoot with the cars problem. I am not a mechanic or a diy er normally but the other halves golf has left me in this predicament .
Vw Golf 1.9 tdi 1998. 90,000 miles. Off the road now for 3 weeks.
It Will crank but won't fire. Our regular mechanic has tried but can not fix it. Had it to vw dealer , they said it had no error codes and that the timing was fine. To expensive to leave it with them for more work so towed it home.
Glow plg light comes on and goes off as normal. Battery seams good. We have check all the fuses. Replaced the 109 relay. Put a new EGR valve on. Replaced all four glow plugs. Changed shut off valve. Replaced engine crank shaft sensor.. Opened up a couple of injectors and cranked and fuel comes out.
Really struggling where to go from here, any help would be really appreciated.
Thanks
Marc

regardless of seeing fuel at the injectors I'd still look at fuel delivery.

Timing is known good mechanically.
GPs are irrelevant at current temperatures

The antishudder valve is definitely open?
No chance of a bad batch of fuel?

I'd replace the fuel filter and re-prime; and try again. Even an unprimed system will show fuel at the injectors, but if it's all working correctly a slightly loosened injector line should squirt fuel strongly...

Any other issues or history leading up to this problem or did the car just not start one morning?

Yes the anti sudder valve is definitely open. The fuel should be ok. I will do the fuel filter and re prime. Then post back with result:
No other issues recently with the car no. It's did this about 3 yrs ago, cure was 109 relay.
Then two years ago same thing , had a new fuel pump on and a crack shaft sensor fixed and run fine for past two years. Until now

Hang a bottle of fuel on the open hood down to the IP and see if it runs that way. If it does then you have a fuel delivery issue from tank to the IP.

I was going to say 109 Relay but, I see it is fairly new. Of course it still could be a bad one. What color was the replacement? If gray I would change it again.

At least I am pretty sure the gray ones are the bad ones. Correct me if I'm wrong on this.

Did they change the timing belt?

It's a black relay and working. Belt was done at 80,000 miles so about 10,000 miles ago. I will try fuel later today.

Had a bottle of fuel to injection pump. Cranked but still no fire .

Gray is Okay.

Black will attack.

Before buying a relay, jump the two main terminals 30 and 85 and see if it runs. If it does, replace the relay. If not continue troubleshooting, starting with how high does the fuel spurt out when cranking?

Jumped the relay but no luck.
There is fuel there when cracking but does not spurt out more pours out.

So you have no high pressure fuel to inject.Are you getting power to the shut-off solenoid?

^^^ This!

Yes I'm getting power to the shut off solinoid.

Crank position sensor? That could you leave you high and dry and won't necessary through a code. It'll crank all day and not fire. Sometimes they just get covered in grime and a spraying it down with electrical cleaner well get you back up and running.

Replaced that as well.

Have u verified compression/timing? Valves ok?

Plastervan said:

Yes I'm getting power to the shut off solinoid.

Click to expand...

Can you say for sure whether power is staying on? Not certain that that 109 relay isn't bad: supposedly you can jumper around it: would need to look up how that's done.

As Whitedog mentionedd, it sounds like you're not getting high pressure out of the pump. THIS is the issue that needs to be resolved. Possible that the IP has crapped out, but I don't think I'd want to jump to that conclusion.