engine can't be revved up - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 55 (permalink) Old 05-23-2017, 04:52 PM
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I said easy, not easier!
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post #17 of 55 (permalink) Old 05-23-2017, 05:30 PM
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Replaced the main fuel pump. Same problem no difference.
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post #18 of 55 (permalink) Old 06-01-2017, 04:08 PM
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Bit of an update.. I think I have proper fuel pressure. I didn't realize but the pressure gauge I just bought only shows up to 10 psi but the needle goes way past that and maxes out to what looks like around 30 psi.. I think the pressure is better than that because the needle shoots so fast.. made a couple videos attached here. I'll buy another pressure gauge to see what it is exactly but I think pressure is good.

Another thing, haven't started her in about a week until today. When I first started her she fired right up and i revved her to around 5000 rpm no problem! Kept revving and she finally died after 20 sec.. I go to start her again and its hard to start and barely stays alive but when she was going after sitting for a while it was like full power.. no idea now.. O2 sensor (was change a year ago)? Bad gas?

Here's some video. All thoughts and ideas appreciated!

https://drive.google.com/file/d/0B1B...w?usp=drivesdk

https://drive.google.com/file/d/0B1B...w?usp=drivesdk
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post #19 of 55 (permalink) Old 06-01-2017, 06:17 PM
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Here's some video. All thoughts and ideas appreciated!
What are the gauges measuring?

- - Eric
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post #20 of 55 (permalink) Old 06-01-2017, 07:31 PM
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Which gauges?
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post #21 of 55 (permalink) Old 06-02-2017, 08:19 AM
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Unplug the AFM and try starting. Basically your taking the Fuel ECU adjustments out of play. It may be hard starting but does it rev up consistently when unplugged for more than 20 secs or due you have the same problem?
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post #22 of 55 (permalink) Old 06-04-2017, 01:29 PM
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She's alive! So I unplugged the AFM as instructed. She wouldn't start after a lot of attempts. I plugged it back in, tried starting again and she fired up! Took it for a pushing distance drive and she seems fine. Let it cool off for a couple house, tried it again and all good! So strange. Did unplugging the AFM reset something?

I also tried unplugging the AFM while she was running and it died. Plugged it back in and all good. I also unplugged/reconnected the AAV for whatever reason in the middle of all this..

A huge thank you to all for the interest in this thread. Best community ever!
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post #23 of 55 (permalink) Old 06-04-2017, 01:56 PM
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Originally Posted by CanHam86Spider View Post
Did unplugging the AFM reset something?
I don't think it does. But you may want to look inside the connector - check for any displaced connectors there. The metal connectors are held in place by a tiny tab of metal. They can get pushed out of position such that they do not make a reliable connection. See: http://www.alfabb.com/bb/forums/spid...connector.html

- - Eric
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Last edited by ghnl; 06-04-2017 at 02:00 PM.
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post #24 of 55 (permalink) Old 06-04-2017, 02:54 PM
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Ok thank you will check that out!
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post #25 of 55 (permalink) Old 06-06-2017, 05:09 PM
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Back to square one today! Same symptoms, won't start again. Barely idles. I didn't do a single thing to the car since it was running fine a few days ago. I just tried starting it today and no dice. I unplugged the AFM, connections look good. Scratched them a bit with my nails, no corrosion or anything. Again, any thoughts or suggestions are appreciated!
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post #26 of 55 (permalink) Old 06-07-2017, 05:49 AM
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Make sure the flap inside the AFM moves freely.

There might be wear on the printed circuit board inside the AFM. But check everything else first - double check the flywheel sensors. I've seen a flywheel sensor that tested OK with the ohm meter but when we removed it the end had a dent. We replaced it with good used part and it started right up.

- - Eric
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Last edited by ghnl; 06-07-2017 at 05:53 AM.
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post #27 of 55 (permalink) Old 06-07-2017, 06:11 AM
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Will do, thank you!
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post #28 of 55 (permalink) Old 06-07-2017, 06:57 AM Thread Starter
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We did check to make sure the flap in the AFM moved freely and it did, but I have a spare unit we can try. We did recently replace a dead flywheel sensor with a used one (couple months ago), and although it worked fine initially, could be on its way out. I did have an intermittent issue with one of mine once but it was either fine or dead and wiggling it around did seem to have an effect. Will try that also.

Keep the suggestions coming!

Mike

'87 Quadrifoglio
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post #29 of 55 (permalink) Old 06-07-2017, 07:36 AM
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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 - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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post #30 of 55 (permalink) Old 06-07-2017, 07:49 AM
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Morning, I had this issue and my Timing was out!!! I moved the disty and its been Great since.. Worth a shot as least looking at..

rob s

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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