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2nd Gen (93-97) V6 2.5L Discussion of Maint Issues for V6

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Old March 30th, 2018, 05:38 AM   #1
MightyMike
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erratic rpm after starting engine several times

Hi guys,
I decided to make another thread after my stalling problem.
I am still unable to find the problem.

My probe starts normal, and runs/idles fine. If after 10 min I shut the engine of and start again it suddenly doesn’t want to start or takes a while before it does start. When it finally starts and I give some gas and let go of the gas-pedal, the rpm’s go all over the place. When it calms down it drops to 0 rpm and looks like the engine is off and then suddenly it comes back to 500 rpm and it keeps doing this a while.
I also had this happening when stopping for traffic lights, and car didn’t want to start at all.
I had to be towed 2 times now. After some time, I could start again and drive.
I replaced the Crank position sensor and ECT sensor but problem still persists.
Also, the ECU doesn’t show any codes.
I am (still) at a loss…
Any idea’s?
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Old March 30th, 2018, 06:07 AM   #2
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Was the distributor changed yet? Coil getting hot? These distributors flat out suck. I have 4 of them laying around and a PGT I can't even move blocking my driveway now due to another shit distributor.. That is on a 95 and from what I understand the 93 and 94 are even worse. If you had verified no vac leaks and pcv valve is working correctly I myself would suspect the damn pos disty. My next PGT I'm about to pick up as soon as its disty goes it will not get another one. MS will be going to a crapless ignition setup. I would start there at this point.
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Old March 30th, 2018, 06:37 AM   #3
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Hi Level 9, Distributor not changed yet. since I did some testing that didn't show distributor problems (and very expensive here to get one..) I just spoke to an electro guy who said it might be the mass(earth) cable. I didn't thought of that. My mass points seems bit rusty maybe I should try fix that first. Is there a way to check if pcv valves works correctly? You need to have an ample supply of nerves with these cars..dont we..
thanks
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Old March 30th, 2018, 06:50 AM   #4
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Lol yes we do. For the pcv I wouldn't think that is the issue but for $2 I'd just change it so you know your vac is all working correctly. These disty problems had me not even wanting to mess with another one for a bit. Check over the grounds and no these distributors are not cheap, so considering I have about a cars cost in distributors laying around it's not cool. Next setup will be distributorless for sure.

I hope everything straightens out for you. Worst case of it came down to swapping the disty and if it were not the problem odds are it will be a good thing to have in the trunk since they are prone to failure if you do plan on holding on to the car for awhile.
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Old March 30th, 2018, 06:55 PM   #5
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If you find out it is not your distributor, plugs, or wires..... then check your timing and ensure that the car didn't jump timing. Put the #1 Cyl at TDC and Physically check your timing marks at the crank. The timing tensioners go bad on these cars all the time and cause the timing to jump a tooth. Also, for the expensive distributers issue, have you considered doing the GM HEI mod? Look it up. OR you could get an after market coil (MSD) Put in, that would solve your Distributer problems for good.
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Old March 31st, 2018, 02:31 AM   #6
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$5 on disty. They fail when they get hot. stick a timing light on a cyl when the problem occurs to confirm you have reliable spark.
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Old April 1st, 2018, 09:04 AM   #7
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Is fuel pressure good?

When was the last time you replaced your fuel filter and/or fuel pressure regulator?
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Old April 5th, 2018, 10:02 AM   #8
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sounds like a distributor problems to me..
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Old April 5th, 2018, 12:45 PM   #9
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Distributor. Get one. If for some strange miracle it's not, you'll have one for the eventuality of when it definitely is.
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Old April 6th, 2018, 07:40 AM   #10
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......Also, for the expensive distributers issue, have you considered doing the GM HEI mod? Look it up. OR you could get an after market coil (MSD) Put in, that would solve your Distributer problems for good.
I would also second the GM HEI mod if a disty issue is what turns out to be the problem.

Made that change to my '94 GT over 10 years ago (even though my disty was not causing any issues at the time), and have had no issues since then.

Relatively inexpensive for all the required parts compared to buying a replacement disty, and fairly easy to complete too.

That said, I've had similar intermittent running issues to what you described in your first post on other vehicles over the years, and those instances turned out to be fuel related (failing mechanical fuel pumps and/or clogged fuel filters).
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Old April 6th, 2018, 06:18 PM   #11
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Another vote for disty! If not disty -then IAC. Both are expensive. But the disty is more likely to be your issue.
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Last edited by KLZE Porsche; April 6th, 2018 at 06:20 PM.
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Old April 9th, 2018, 03:46 AM   #12
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Thanks for all the help guys,
I changed fuel filter yday and no change. Even after few minutes, its stalling on its own and when I added some gas, rpm's went haywire..
So you all convinced me to order a new disty..lol. Now waiting till it arrives.
I have a question about the disty though, I noticed on the disty cap that the firing order is (clockwise) 4,5,3,2,1,6 I read that some other ZE's had different ones.. Is this correct?

---------- Post added at 12:46 PM ---------- Previous post was at 12:44 PM ----------

Quote:
Originally Posted by Silverprobe View Post
I would also second the GM HEI mod if a disty issue is what turns out to be the problem.

Made that change to my '94 GT over 10 years ago (even though my disty was not causing any issues at the time), and have had no issues since then.

Relatively inexpensive for all the required parts compared to buying a replacement disty, and fairly easy to complete too.

That said, I've had similar intermittent running issues to what you described in your first post on other vehicles over the years, and those instances turned out to be fuel related (failing mechanical fuel pumps and/or clogged fuel filters).
I'm not sure if I dare to do this myself.. But yes, would be nice to get these disty problems of my ass for once... lol
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Old April 9th, 2018, 10:56 AM   #13
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I'm not sure if I dare to do this myself.. But yes, would be nice to get these disty problems of my ass for once... lol
Honestly, that hardest part of the job once all of the parts were accumulated was fabricating a piece of metal to act as a mount/heat-sink for the ignition module and deciding on where to locate it in the engine bay. I chose the metal bracket between the battery and the fuse box.

After that, it was simply a matter of getting everything connected and modifying the current distributor to bypass the internal ignitor (which is usually the main cause of issues with these distys anyway).

For the wiring that I spliced into the stock harnesses, I used a male/female 5-prong trailer harness, one end to the disty, the other to the HEI module, with their connecting plugs meeting at the air intake tube next to the battery making for an easy disconnect point when I need to remove the air intake tubing and air filter box.

All I know at this point is that about $35 US dollars in parts is sure better than whatever replacement distys cost these days, especially a disty that's more than likely prone at some point to having the same problems as the one just replaced.
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Old April 9th, 2018, 12:01 PM   #14
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Honestly, that hardest part of the job once all of the parts were accumulated was fabricating a piece of metal to act as a mount/heat-sink for the ignition module and deciding on where to locate it in the engine bay. I chose the metal bracket between the battery and the fuse box.

After that, it was simply a matter of getting everything connected and modifying the current distributor to bypass the internal ignitor (which is usually the main cause of issues with these distys anyway).

For the wiring that I spliced into the stock harnesses, I used a male/female 5-prong trailer harness, one end to the disty, the other to the HEI module, with their connecting plugs meeting at the air intake tube next to the battery making for an easy disconnect point when I need to remove the air intake tubing and air filter box.

All I know at this point is that about $35 US dollars in parts is sure better than whatever replacement distys cost these days, especially a disty that's more than likely prone at some point to having the same problems as the one just replaced.
Thanks for explaining, maybe Ill look up some guys that could give me a hand with this when I decide to go the HEI way..
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Old April 9th, 2018, 05:40 PM   #15
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Don't wait too long erratic idle destroyed my crankshaft key and key way under the crank pulley.
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Old April 10th, 2018, 05:46 PM   #16
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Thanks for explaining, maybe Ill look up some guys that could give me a hand with this when I decide to go the HEI way..
Not sure what was so funny.

Maybe I just don't understand the Netherlands sense of humor? I encountered a guy from the Netherlands on another message board once, and HE sure didn't seem to have one anyway...
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Old April 10th, 2018, 07:50 PM   #17
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Not sure what was so funny.

Maybe I just don't understand the Netherlands sense of humor? I encountered a guy from the Netherlands on another message board once, and HE sure didn't seem to have one anyway...
My guess: If you say "go the HEI way" in Dutch, it sounds like "go the highway". So it's a Dutch/English pun.
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Old April 11th, 2018, 07:42 AM   #18
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My guess: If you say "go the HEI way" in Dutch, it sounds like "go the highway". So it's a Dutch/English pun.
Sounds good. We'll go with that. Similar to the pronunciation of Eindhoven.
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Old April 11th, 2018, 11:45 AM   #19
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calm your tits, Francis.
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Old April 11th, 2018, 04:14 PM   #20
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calm your tits, Francis.
F.O. mando.
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