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DSPTurtle's Avatar
 
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Won't Stay Running

So I got the motor to start... for about 10 seconds. It will run for 5-10 seconds when i turn the key. If my wife turns the key and I jiggle the metering plate it will run for 15-20 seconds.
I have rotated the dizzy left and right. I have backed the idle screw out almost all the way at this point.
What I have not done is mess with the mixture screw (ok, I messed with it a little bit but was afraid to do too much). Does anyone know what a good "starting point" for the mixture screw is?
Same question on the idle speed screw... is there a good starting point?
The CIS fuel head screams when I depress the plate with the fuel pumps running and the motor not running. I have never heard that on my other turbo but then again I am not sure. Is it possible that even after cranking, running, priming and fiddling for 30 minutes or more that there is still air in the lines?
When it catches and runs, it sounds like it is running on all six. It just won't keep running.
All help is greatly appreciated.
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Old 09-11-2011, 05:42 PM
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I can hear the injectors on mine as well when I press down on the metering plate.

Have you tried to see if it will run on starter fuel?

This would at least rule out ignition if it works.
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Old 09-11-2011, 05:51 PM
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I have plenty of spark, plenty of fuel, and plenty of air. At least I think I do. I can hear the CDI whining the whole time.
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Old 09-11-2011, 05:58 PM
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This is the best I can get out of him...

00057 - YouTube

You can hear the CDI whining and then the fuel pumps running after I turn the key.
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Old 09-11-2011, 06:33 PM
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Pulled #4 injector to test. Seems to be working fine when I manually depress the metering plate. Here's a link to the injector spraying...
00058 - YouTube
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Old 09-11-2011, 07:05 PM
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WURs cold start pressure? Would it stay running if you kept your foot on the pedal for some 2000 rpms idle?
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Old 09-11-2011, 07:27 PM
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Foot on pedal made no difference. I fear I may have made a mess of the mixture control trying to get things working. Anyone know how to "reset" that mixture control screw
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Old 09-11-2011, 07:44 PM
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I don't know how to reset it but AFR gauge should give some pointers on that. 1/4 turn is A LOT of change so it only takes little adjustments to make difference and thats why it's easy to mess out of operating range.

I would possibly turn it ccw to make it leaner first so it would not start and then start richening it. But your exhaust did not puff rich smoke so maybe you are already too lean?

Have you checked for vacuum leaks?

BTW. You do not want to test one injector at time as then it fills the other cylinders with fuel.
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Old 09-11-2011, 07:53 PM
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I hear you on the injector test... it was a ghetto test since I knew I would not be turning it over again tonight (way too loud with no exhaust and kids have school tomorrow) I wanted to make sure that the fuel head was flowing gas and not still chock full 'o air.
And it really does not run long enough to get an AFR reading
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Last edited by DSPTurtle; 09-11-2011 at 09:21 PM..
Old 09-11-2011, 08:03 PM
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You can turn the AFR on before you start so it will show if its too lean. You need wideband gauge though.
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Old 09-11-2011, 08:16 PM
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Is it me, or does it seem to take a while to fire. If you do this test a few times in a row does it seem to fire any faster? I've got a fuel pump issue and it takes that long to fire, but after a few tries, system is primed when and it catches on the fist crank and a half...
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Old 09-11-2011, 09:00 PM
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Seems it could be low on system pressure but start up injector should still start it pretty fast. Maybe bad accumulator or no check valves in the fuel pumps. I only got a check valve in the front pump but mine starts fast.
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Old 09-11-2011, 09:13 PM
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It fires up pretty quick. The cold start valve is definitely getting fuel... please don't ask me how I know
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Old 09-11-2011, 09:28 PM
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Would it stay running if someone [you] were pressing and holding the metering plate down about 1/8" while your wife starts the car??
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Old 09-12-2011, 04:47 AM
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way out of left field...but

i had a problem where my car would start die, restart run for about 5 seconds die, start again, run for 8 seconds die, start third time, right up and run great...

replaced fuel filer and accumulator and never had problem since

i am guessing the accumulator was bad and wouldnt hold pressure in the system
Old 09-12-2011, 06:27 AM
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Basics...

have you verified system pressure and cold/warm control pressures are in spec?

in my experience a large vacuum leak might also cause your symptom.
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Old 09-12-2011, 06:55 AM
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Quote:
Originally Posted by DSPTurtle View Post
Foot on pedal made no difference. I fear I may have made a mess of the mixture control trying to get things working. Anyone know how to "reset" that mixture control screw
Here is a hint on getting that mixture screw close to where you want it without a test gauge.

Trouble cold starting

Ooops just realized that test only works if the car is warmed up, no help to you at the moment. You might want to check that thread anyhow for some hints on cold starting issues though.
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Last edited by oilonly; 09-12-2011 at 02:25 PM..
Old 09-12-2011, 02:23 PM
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I checked the control pressures and they were way high. I realized that my front pump was still Carrera vintage. Therefore it was pushing too much pressure. Popped the front pump relay and the pressures dropped to within spec with just the rear pump. Got the motor to start and high idle for about 30 seconds. It died as soon as I tried to blip the throttle.
Not sure why it died (and would not fire up again... probably something in the dizzy timing) but my next step will be to source a correct front fuel pump.
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Old 09-12-2011, 02:39 PM
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I don't think you need to swap the front pump. Just adjust the system pressure to 6.8-7bar and then adjust the cold pressure according your climate and then idle CO.
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Old 09-12-2011, 07:25 PM
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Quote:
Originally Posted by smurfbus View Post
I don't think you need to swap the front pump. Just adjust the system pressure to 6.8-7bar and then adjust the cold pressure according your climate and then idle CO.
You make it sound so easy. Come on over to Florida... I got tools, gauges and beer. SHow me how to do what you just said...
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Old 09-12-2011, 07:29 PM
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