At my wits end.. Looking for any idea.

[evilunclegrimace]

I had the same problem. In researching this problem there are many owners with this issue. I changed and adjusted way more items than the original poster. Everyone said the same type of fixes except one. The harmonic balancer. This part has issues of deteriorating within. Check the harmonic balancer. That was the problem with mine.

Are you saying that a harmonic Balancer will cause stalling and drivability issues?

 

[bobby v]

Hi Retorq, where you located ?: 1628"]I have a cable and probably the closest guy to you on the

I'm in Kingman.

Isn't that fuel pressure a little low? The cable I have is the ALDL cable for Gen 1/1.5s. Generally you can look at your stream realtime, no tuning capabilities with just the cable, that takes some other hardware. The software is on laptop that doesn't/hasn't run in a while. Maybe if the shop can't fix it I could bring a cable and notebook when it's not 250 degrees in the shade!! Hahaha

Thanks Retorq, Kingman isn't too bad, as you know it becomes a challenge living in rural towns to get anything done. I think they said the FP range was 9-13lbs but I could be wrong, had so many things thrown at me lately I get confused.
I found the CEL wasn't working so I got that resolved and made the home made paper clip connector, got no codes whatso ever, either thats good or bad depending on how you take it.
We'll see what the shop comes up with and I'll keep you in the loop.
I have asked /searched this burg till Im blue in the face for someone to ehlp me figure it out but so far no luck
And yes it was hotter than hell today so I hope they get my aux fan problem figured out or it will be sittin in the garage for a while
Bobby V
PS Too bad this forum doesn't have PM's, or does it ??

 

[Schurkey]

I think they said the FP range was 9-13lbs but I could be wrong,

Yup.

I found the CEL wasn't working so I got that resolved

Are you sure? CEL comes on for awhile with the ignition?

and made the home made paper clip connector, got no codes whatso ever, either thats good or bad depending on how you take it.

No way at all that's good.

If you aren't getting code 12, either you're doing it wrong or the computer or CEL is broken.

Too bad this forum doesn't have PM's, or does it ??

PM sent.

 

[95flatblack]

Are you saying that a harmonic Balancer will cause stalling and drivability issues?

Yes. Truck would run for a bit then stall. Rpm's would fluctuate, I'd thought I was timing the engine but with the breakdown of the balancer, engine was never really in time. I changed from fuel pump to temp. sensor and everything in between. Many owners of these trucks have the same problem. I don't know how many hours I tried to find an answer over the net. All I saw was fuel pressure, fuel pump, sensors etc. I didn't have all the test equipment that I needed to check all the recommendations. But bought the test equipment as needed. This may not be the posters problem, but it wouldn't be a bad idea to check. There was one other item that I read about. I don't know the exact specifics as its been years but I read where the automatic transmission had a defected valve located inside, that will cause similiar issues that the poster is experiencing. Like I said, I don't know the specifics, but maybe a transmission man can have some input. No, I'm not crazy, just a guy who is trying to help a poster.

 

[bobby v]

Yup.


Are you sure? CEL comes on for awhile with the ignition?


No way at all that's good.

If you aren't getting code 12, either you're doing it wrong or the computer or CEL is broken.


PM sent.

Guess I should be more clear in my posts
Does "yup" mean the FP is Ok or they/I were wrong ?
CEL now comes on with ignition then goes off ( the PO had some LED bulbs in there that weren't working, now they are)
I DO GET THE 12 code and nothing after that so that means the ecm is working correctly right?
Thanks
Bobby V

 

[Schurkey]

Guess I should be more clear in my posts
Does "yup" mean the FP is Ok or they/I were wrong ?

Fuel pressure spec is 9--13. They were correct. Given a choice, I'd prefer to be at the higher-end of the range.

CEL now comes on with ignition then goes off ( the PO had some LED bulbs in there that weren't working, now they are)
I DO GET THE 12 code and nothing after that so that means the ecm is working correctly right?

Getting code 12 means the system is working. It does not mean that EVERYTHING is working, just the part of the computer that can display trouble codes and turn on the CEL.

"Codes" are handy. The data stream is AT LEAST as useful, often more helpful than the trouble code. That's why I harp on and on about connecting a scan tool--to view the data stream.

 

[bobby v]

Thanks Schurkey, appreciated
Seems a member is sort of close to me who has the ALDL thing, Retorq, so if this whole deal isn't fixed when I get the truck back 2morrow then maybe a fix it trip will be in order, of course that will tell ME NOTHING lol, so someone like you can maybe decode it for me, or anybody besides me.. Im hoping for the best on its return so that I can move on to other mods I want to make, we'll see I guess
Bobby v

 

[Shtbox69]

I chased ghost like that on a 88C2500. Checked grounds at t-stat housing and I had bad ignition module in dist. Dont forget the grease undee it. Hope it helps.

 

[evilunclegrimace]

Disconnect the TPS and see if the ECM recognizes the fault. If it does them it is possible that the ECM is fine

 

[getty cripple]

Okay, this may be a long post so apologies in advance.

I have a 94 1500 with the 350 TBI. I have owned this truck a little over a year now. I bought it with a blown motor because P.O decided to run it hot and then put water in the coolant and it froze and busted the block. Regardless, found a really clean re-manned motor from a 95 tbi at the junkyard. Replaced every seal and gasket, other than head gaskets. Well the truck runs and drives of course, has good oil pressure, however, it takes it a couple of extra cranks to start, and then on top of that, it has a random / slight misfire only noticeable at idle. Well, this is where the fun begins. Here is what I have replaced with either new or used (verified working) parts...

New 02 sensor
TBI rebuild kit
Distributor with new cap, rotor, wires. (Used delco plugs gapped appropriately)
Timing chain
Coolant temperature sensors
IAC valve
MAP sensor (Keep this part in mind for a second)
New complete fuel pump / sending unit and new fuel filter
Ignition coil

Now here is the fun part. A couple of weeks after replacing the o2 sensor, I was leaving work, started the truck as normal, and about a minute or so later, truck dies. Cranks, but no start. Waited a few minutes, truck started back up and ran like it normally does. Didn't think to terribly much about it. However, yesterday. Was driving it home from work, was working like normal, then just dies again. Okay... odd. Try to start it, cranks, but thats it. Checked fuel pump fuse, checked distributor wires, checked all sensors were plugged in. Nothing. I walk a little over a mile back home, grabbed some starting fluid and drove back to the truck. Got in it before doing anything, truck starts... dies 30 seconds later. Start it again, i'm able to rev it fine, as soon as it goes back to idle, dies again. Wouldn't start again after that. Tried starting fluid, it fires but immediatley dies again. Left it for about 10 minutes, (checking my phone for ideas) try starting it again and it runs and gets all the way back home and hasn't died like that again.

So here is where i'm at today. I have the truck up to temperature. Idling rough-ish like always.. Timing is correct btw. I unplug the MAP sensor.. truck runs extremely rich. HOWEVER, idles and starts perfectly like a new truck. Changed with another MAP sensor. No difference. Checked the voltage to the MAP sensor, getting 5 volts without engine running which is were it needs to be, so connector is out of the question. Changed over to another TBI unit thinking maybe I had bad injectors. No difference. However it hasn't stalled again, but I haven't really drove it.

So at this point i'm at my wits end, I've checked vaccum lines as well, everything seems fine. No intake manifold leak or anything. Does anyone have an idea, of what else it may be. Because I'm about ready to slap a blue oval on the grill of this truck... if you catch my drift.
Thank you guys in advance, and again. Sorry for the long read / rant.

Okay, this may be a long post so apologies in advance.

I have a 94 1500 with the 350 TBI. I have owned this truck a little over a year now. I bought it with a blown motor because P.O decided to run it hot and then put water in the coolant and it froze and busted the block. Regardless, found a really clean re-manned motor from a 95 tbi at the junkyard. Replaced every seal and gasket, other than head gaskets. Well the truck runs and drives of course, has good oil pressure, however, it takes it a couple of extra cranks to start, and then on top of that, it has a random / slight misfire only noticeable at idle. Well, this is where the fun begins. Here is what I have replaced with either new or used (verified working) parts...

New 02 sensor
TBI rebuild kit
Distributor with new cap, rotor, wires. (Used delco plugs gapped appropriately)
Timing chain
Coolant temperature sensors
IAC valve
MAP sensor (Keep this part in mind for a second)
New complete fuel pump / sending unit and new fuel filter
Ignition coil

Now here is the fun part. A couple of weeks after replacing the o2 sensor, I was leaving work, started the truck as normal, and about a minute or so later, truck dies. Cranks, but no start. Waited a few minutes, truck started back up and ran like it normally does. Didn't think to terribly much about it. However, yesterday. Was driving it home from work, was working like normal, then just dies again. Okay... odd. Try to start it, cranks, but thats it. Checked fuel pump fuse, checked distributor wires, checked all sensors were plugged in. Nothing. I walk a little over a mile back home, grabbed some starting fluid and drove back to the truck. Got in it before doing anything, truck starts... dies 30 seconds later. Start it again, i'm able to rev it fine, as soon as it goes back to idle, dies again. Wouldn't start again after that. Tried starting fluid, it fires but immediatley dies again. Left it for about 10 minutes, (checking my phone for ideas) try starting it again and it runs and gets all the way back home and hasn't died like that again.

So here is where i'm at today. I have the truck up to temperature. Idling rough-ish like always.. Timing is correct btw. I unplug the MAP sensor.. truck runs extremely rich. HOWEVER, idles and starts perfectly like a new truck. Changed with another MAP sensor. No difference. Checked the voltage to the MAP sensor, getting 5 volts without engine running which is were it needs to be, so connector is out of the question. Changed over to another TBI unit thinking maybe I had bad injectors. No difference. However it hasn't stalled again, but I haven't really drove it.

So at this point i'm at my wits end, I've checked vaccum lines as well, everything seems fine. No intake manifold leak or anything. Does anyone have an idea, of what else it may be. Because I'm about ready to slap a blue oval on the grill of this truck... if you catch my drift.
Thank you guys in advance, and again. Sorry for the long read / rant.

Not sure if it has been mentioned,
But the fuel pump or the fuel pump relay I have a 94 and there just isn't much more you c a n check it sounds like a clogged fuel problem.