Warm start problem
Discussion
LeeHabbers said:
Done a wet test and cylinder 3 and 4s psi went up to 300psi so to me that says the piston rings in those cylinders are leaking. So keep it going till it dies.
It's the same car, yes? Unless you've done something about these ticking noises and low compression and suspect injectors since you raised it last year, I think you already know the answer.Most got sorted after loads of wedge chucked at it 😭 it's been fine for a while and now this, just ignored it as its been too cold to have a dig around and I rarely go out in the car anyway, other than to work and even then when I get back in the car it's been sat around for a while so its cold when I start the pig back up so it fires up no problem. Just a 
to start if I've done a trip and parked up for 10 mins like to get some shopping and then I'm there for about 10 mins trying to get it to start.
to start if I've done a trip and parked up for 10 mins like to get some shopping and then I'm there for about 10 mins trying to get it to start. stevieturbo said:
So how do things look on Tech2 or Vauxcom when trying to start ? Is there a good rpm signal ? Can you scope the crank and cam triggers ?
How is rail pressure when cranking ?
Don't have access to Tech2, I tried Vauxcom a few years back and it doesn't work on my car for some reason. No idea when it comes to doing checks like what your asking. I have been doing a bit of reading online and I'm suspecting a cam sensor, I've ordered one as they're not overly expensive, so I'll see what that does. If not I may see about taking it to someone with the scanning tools to have check it all outHow is rail pressure when cranking ?
stevieturbo said:
Parts cannon.....
If you have no means to diagnose anything, how do you ever expect to try and fix it ?
And Vauxcom will work. If there is an issue, contact the dealer you bought it from and I'm sure they can advise.
I don't have all the diagnostic tools under the sun. I have some bits here and there but not for checking this. I did buy a Leak Out Tester which I used today. Ran it for 3 mins and was hoping not to get out over 30ml (as per a diesel specialist). Cylinder 1 leaked 30ml, cylinder 2 was 35ml, cylinder 3 was 40ml and cylinder 4 was just over 40ml, not looking good and explains the hard starting when warm, looks like lack of fuel pressure. I did contact them and they said the software doesn't work for my car. Gonna need a Tech 2 or something similar soon if I'm looking at replacing injectors. If you have no means to diagnose anything, how do you ever expect to try and fix it ?
And Vauxcom will work. If there is an issue, contact the dealer you bought it from and I'm sure they can advise.
Stiggolas said:
I had a SAAB recently that did just this (used Vaux parts). Cold was fine, warm no chance. Turned out to be the crank sensor. If you cooled it with a water spray, it started fine. Simple replacement too 
I've got the crank sensor to go in. Gonna do it on Saturday morning when I'm giving it a service as the cars on stands. I know getting out old crank sensors out can be a right pig and didn't want to be laying under a car when it's freezing, snowing or raining. Fingers crossed the sun comes out. 
What would happen if the High Pressure Fuel Pump is on its way out? Only asking cause the brum brum is driving really lumpy when it get at OP temp now. Suspecting this or maybe the new crank sensor, its all adding to current problems. Need rid of this car ASAP, hopefully it'll last till September when I can hopefully get a new BETTER car.
Think the car is shagged. Tried starting it this morning and it takes ages to fire up and when it does it dies within seconds. If I keep the revs up it stays alive but its lumpy. Seems like it's not firing on all cylinders. No codes have come up at all which makes me think it's not a sensor cause surely they'll throw out some codes. Was suppose the change the AR bushes in my Mrs car today but looks likes I'll be fiddling with my st heap instead.
t heap instead. Got the pig started, lumpy as fk and if I turn the engine off it won't start. The fuel rail pressure with ignition on is around 100psi. When I start cranking it shoots up to around 6000psi so pressure is there. I replaced the fuel pump about a year ago so can't be that... Can it? You can get dud ones I suppose. When engine was running the injectors sound normal (used a stethoscope). Its pumping out st loads of black smoke so the fuel/air ratios are getting scrambled up somewhere.
k and if I turn the engine off it won't start. The fuel rail pressure with ignition on is around 100psi. When I start cranking it shoots up to around 6000psi so pressure is there. I replaced the fuel pump about a year ago so can't be that... Can it? You can get dud ones I suppose. When engine was running the injectors sound normal (used a stethoscope). Its pumping out st loads of black smoke so the fuel/air ratios are getting scrambled up somewhere. Gassing Station | Engines & Drivetrain | Top of Page | What's New | My Stuff