Are my plug wires bad and if so would that cause stalling after the car is hot? - Page 11 - Alfa Romeo Bulletin Board & Forums
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post #151 of 302 (permalink) Old 04-15-2017, 09:03 PM Thread Starter
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Yeah. Almost certainly leaking injector seal(s). Buttoned back up and purring.
Went ahead and replaced with FPR with a brand new Bosch piece. The pressure continued to randomly drop to 0 with no external leaks or from the injectors. So far so good.


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post #152 of 302 (permalink) Old 04-15-2017, 09:05 PM
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I don't recall, have you done a compression test recently? Could you have sticking valve(s)?

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post #153 of 302 (permalink) Old 04-15-2017, 10:58 PM
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I don't remember now, what codes did you get from the diagnostic readouts from the car, using the test sequences built in?

Del

Seattle

1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27

previously owned since 1964:

62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6
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post #154 of 302 (permalink) Old 04-16-2017, 09:35 AM Thread Starter
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Well now it won't even start. Every once in a while I get a pop, but no start. It sure what's going on...


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post #155 of 302 (permalink) Old 04-16-2017, 10:04 AM Thread Starter
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Are my plug wires bad and if so would that cause stalling after the car is hot?

Plug wires and coil connected. Distributor is on the mark with 1 at tdc. Cam marks line up. Grounds connected. Spark being made. Injectors pulsing. Fuel pressure good. Cranking. Just no ignition anymore. At least before it would run, albeit briefly.
Maybe time to call in the expert. I need a break from his car.


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post #156 of 302 (permalink) Old 04-16-2017, 07:05 PM
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I wish you could get another known-good AFM to test by substitution. I wish somebody could loan you one, and I sure would myself if I had one. I'd ship it to you tomorrow...

And before you plugged in that AFM, I would ring out the wires in the connector itself to ensure they make good contact.

As I look back over all 11 pages of this post, the AFM and the ECU are two major items that have not yet been ruled out, correct?

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post #157 of 302 (permalink) Old 04-17-2017, 07:07 AM Thread Starter
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I think I'm getting known-good AFM and ECU to test out in the next few days. I checked the continuity of wiring from the AFM and all of the sensors to the ECU harness just last year, with no issues.

I'm not convinced I didn't damage something when I was reinstalling the fuel rail though. Even when the injector seals were leaking so badly, the car would start and run, albeit not for very long or very well. Now it won't even start. I'm going to take a few days break from it, go back through all of the systems and make a checklist, then try again soon. Need to replace my noid light that my old neighbor moved away with. Plugs are getting juice, though. I did confirm that.
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post #158 of 302 (permalink) Old 04-17-2017, 05:18 PM
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Are you able to pull any diagnostic codes from the car systems, and did you do that when the car was able to run?

Del

Seattle

1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27

previously owned since 1964:

62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6
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post #159 of 302 (permalink) Old 04-17-2017, 06:11 PM Thread Starter
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No OBD in an '83 GTV6, so any codes would just be readings from the multimeter.


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post #160 of 302 (permalink) Old 04-17-2017, 07:47 PM
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Oh, yeah, I keep getting side tracked by the guys with problems with their 164s. Sorry. Get you confused with a guy that had trouble with his 164.

Never mind. Hope you get this figured out, as both of the GTV6s I drove were fun, esp the 86, best of that bunch.

Del

Seattle

1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27

previously owned since 1964:

62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6

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post #161 of 302 (permalink) Old 04-20-2017, 03:11 PM Thread Starter
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At this point I think I have to assume there's something very wrong internally. All of the injectors leads check out with the noid light. Fuel pressure is good. Spark is good. Timing marks are all aligned. Belt has tension. Starter cranks easily. Battery is good and fully charged. Etc.

Cranking the engine now produces a mechanical clanging sound, but ONLY when the injectors and plug wires are connected. When I had everything unplugged to try the noid light and check compression, no clanging. Reattach everything, clanging.

I feel like I'm out of my depth. Contacted a local mechanic who's appeared in this thread but right now I have literally no free time to deal with it. Maybe in early May...

Frustrated and alarmed. I'm hoping it's something simple and dumb that I've overlooked but I have this feeling in my gut that's not the case. This might be it.


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post #162 of 302 (permalink) Old 04-20-2017, 07:25 PM
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Mr. Chairman, can you pull the distributor cap off, pull the rotor and see if the keyway is stripped? Have you watched the rotation of the distributor shaft lately as the engine cranks, and verified the rotor's at the right spot, firing number 1 at TDC?

Random spark firing might give you that kind of sound. Mike's car had some bad gas in the bottom of the tank last summer, after sitting here for awhile, and when we went to start it up, I could have sworn the cam belt had slipped and it had low compression, and it made unusual noise when cranking. We did a tune up (it was due), torqued the heads, verified the timing, fresh gas and fuel system preserver, and after a couple of pops it started and ran like a champ.

I know I'm asking a lot of you at this point! I'm beginning to believe in the demon-possessed supernatural as far as this motor's concerned...
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Last edited by alfaloco; 04-20-2017 at 07:40 PM. Reason: Never say die!
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post #163 of 302 (permalink) Old 04-20-2017, 07:49 PM Thread Starter
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You nailed it. I'd recently replaced the rotor and I guess when installing it I chipped the plastic/Bakelite/whatever it is and opened up the keyway. I suppose the rotor was sort of wobbling. Swapped the old one back in. I got excited thinking I'd solved the start/stall as well, but alas. It does start now, and easily. Idles smoothly. Then dies.
Plan to try swapping the AFM for a known good one, maybe this weekend if I can get my hands in it.


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post #164 of 302 (permalink) Old 04-20-2017, 07:59 PM
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Hot diggety dog!!

It happened to me, a couple of times over these many years.

Gunga Din lives!

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post #165 of 302 (permalink) Old 04-21-2017, 01:25 PM Thread Starter
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Picking up a spare AFM and ECU this weekend to test out. Fingers crossed. At this point I'm not sure what else it could be!
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