engine can't be revved up - Page 3 - Alfa Romeo Bulletin Board & Forums
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post #31 of 55 (permalink) Old 06-07-2017, 09:25 AM Thread Starter
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Quote:
Originally Posted by spiderserie4 View Post
CanHam
just backtracking a bit here: you say your fuel pressure tester (in those videos) only goes up to 10psi.....that I find really odd
you certain?

try pinching the FPR return line again and starting her....I mean if it starts with a pinched line I just cannot see the AFM being suspect....more like the FPR
Dom, what he meant by that is he borrowed a gauge from someone and the gages scale only goes to 10psi.

Mike

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post #32 of 55 (permalink) Old 06-07-2017, 11:19 AM
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Rob - Will definitely try that thanks!

Dom - Yes, the scale only goes to 10 PSI but the needle goes way past that. Have a look at the video.. The pressure seems strong. If we can't get her going tonight I'll pickup another fuel pressure gauge this week.
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post #33 of 55 (permalink) Old 06-11-2017, 07:39 PM
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Did a compression test today, here are the results...

From front to back cylinders

Cold engine all plugs in
120
105
120
120

Hot engine plugs in
120
120
125
135

Hot engine plugs out
130
130
135
115

Compression seems good?

Same symptoms, hard to start, takes about 10-15 min, Once shes going she either dies when you give gas or is ok for 5-10 min, can rev to 5000 and then eventually dies.. Very intermittent. Reasons why I was guessing a head gasket failure. As long as I've had her (two years) she leaks a bit of oil or emissions into the coolant. Nothing goes into the oil, it's always been very clean. I do a coolant flush every six months or so and it's clean for a while.

She's been a daily driver for almost two years and she just quit on me last month all of sudden.
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post #34 of 55 (permalink) Old 06-12-2017, 01:47 PM
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numbers really low, >10% variation. needs head gasket at min - probably engine build.
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post #35 of 55 (permalink) Old 06-12-2017, 02:38 PM
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You could try re-torqueing it and see if the numbers improve. It is safe to go to 70 ft-lb provided that you do it in steps of about 10 ft-lb. Make sure that the washers under the nuts are lubricated.

Ed Prytherch
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post #36 of 55 (permalink) Old 06-12-2017, 02:44 PM
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I've been wanting to do the gaskets, just wanted one more drive to get it to the shop instead of towing.. Will try re-torquing! Thanks again gents!
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post #37 of 55 (permalink) Old 06-27-2017, 10:09 AM Thread Starter
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Hey all, we could still use some ideas on this one.
We have fuel (clean, full tank, new main pump,etc.) and good pressure (35-40 psi), and spark (and the coil checks out).
No vacuum leaks, no loose connectors, flywheel sensors are good, grounds attached and clean, tried swapping the AFM, new plugs, etc.

Head gasket is definetely an issue, but could this alone prevent the engine from starting and running repeatably?
One day/time it starts and runs for a min like nothing is wrong, another day/time it won't start, another day/time it'll idle but not rev up.

I've finally decided to get his Spider to my house to dig deep into it, and I'm at whits end, and fearful that if I don't get this solved, in my hysteria I might have it towed to a wreckers and tell him it got stolen!

Mike

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post #38 of 55 (permalink) Old 06-27-2017, 10:12 AM
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Yah so you can salvage the parts!?
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post #39 of 55 (permalink) Old 06-27-2017, 10:29 AM
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hard to tell what is wrong from here, but low compression like that will not prevent it from running. unless the sump is full of coolant - as in coolant is likely to be spraying into the combustion chamber - not going to stop the car from running either. might not run great, but will run.
would not panic yet. ran and then stopped.. something broken... need to find it. persevere, you will. if no alfa shops near you, you could try taking to an independent VW shop - i think they are all well versed in Ljet.
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post #40 of 55 (permalink) Old 06-27-2017, 10:44 AM Thread Starter
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And just to be clear, my question about the head gasket is two-fold.
1. if the compression is too low for it to run - however sometimes it does (not for long) but mostly doesn't run, so I don't think so.
2. could the sludge (because there is oil in coolant - not vice versa), be buggering up a critical sensor(s) readings to the computers

Thanks

Mike

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post #41 of 55 (permalink) Old 06-27-2017, 10:46 AM Thread Starter
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One more thing... CanHam says he thinks he smells fuel in the oil.
So maybe and intermittently sticking open injector(s).
Is there any trick to confirm or rule out, short of removing them and sending them for testing/cleaning which is probably long overdue anyways.

The last time I checked with a stethescope I could hear them clicking away.

Thanks

Mike

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post #42 of 55 (permalink) Old 06-27-2017, 10:50 AM
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I don't recall if it has been mentioned - peek inside the wire harness connector to the AFM. The metal connectors can become displaced such that they might be making intermittent contact.

http://www.alfabb.com/bb/forums/spid...connector.html

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post #43 of 55 (permalink) Old 06-27-2017, 12:09 PM Thread Starter
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Quote:
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I don't recall if it has been mentioned - peek inside the wire harness connector to the AFM. The metal connectors can become displaced such that they might be making intermittent contact.

http://www.alfabb.com/bb/forums/spid...connector.html
We did try that, which I think it was you that suggested it, and the contacts all looked ok. We even swapped in another AFM and no improvement.

Thanks

Mike

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post #44 of 55 (permalink) Old 06-27-2017, 01:12 PM
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Did you check the Disty, I had mentioned before... It was loose on mine and I had the same issue.. Timing was off, I fixed it and tightened and all has been good...

Rob S,Cur,84 Spider,,91 164l,Prev 01 XK8,77 spider,87 Milano,91 164L ,81 Spider,81 380SL,63 BJ8 Healey, 76 Spider,79 Spider,90 quad spider.348 Ferrari spider.Harleys
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post #45 of 55 (permalink) Old 06-27-2017, 02:01 PM Thread Starter
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Did you check the Disty, I had mentioned before... It was loose on mine and I had the same issue.. Timing was off, I fixed it and tightened and all has been good...
Sorry, we did check to make sure it was fully seated and not loose.
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Mike

'87 Quadrifoglio
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