Jump to content

New Engine Dies Need Help

arrowshooters

Recommended Posts

arrowshooters Enthusiast

arrowshooters

Posted
Posted

Had the timing set on my new/rebuilt 98 5.7 today. It was pretty far off so I figured that was the cause of my engine dieing when coming to a stop. Well my engine ran a whole lot better and I thought I was out of the woods, but after awhile it started dieing again.

 

This issue does not happen when the engine is cold, only when it is up to temp and driven a little bit. I will be slowing for a stop and it just shuts off. I can pop it in neutral, start it right back up, and off I go as if nothing was wrong until the next time I slow down either for a stop or a turn. It acts like two things to me: either a huge vacuum leak (but a vacuum guage has me well in the green and I sprayed everything I could find with Brake Cleaner), or it's like I have a manual trans and slowing down without the clutch in.

 

I am sooooooooo stumped.

dlewis1111 Senior Enthusiast

dlewis1111

Posted
Posted
Had the timing set on my new/rebuilt 98 5.7 today. It was pretty far off so I figured that was the cause of my engine dieing when coming to a stop. Well my engine ran a whole lot better and I thought I was out of the woods, but after awhile it started dieing again.

 

This issue does not happen when the engine is cold, only when it is up to temp and driven a little bit. I will be slowing for a stop and it just shuts off. I can pop it in neutral, start it right back up, and off I go as if nothing was wrong until the next time I slow down either for a stop or a turn. It acts like two things to me: either a huge vacuum leak (but a vacuum guage has me well in the green and I sprayed everything I could find with Brake Cleaner), or it's like I have a manual trans and slowing down without the clutch in.

 

I am sooooooooo stumped.

 

Idle air control dirty or bad? Did you adjust timing with the connector on the firewall disconnected? (I think this applies to yours)

Sir Dan Enthusiast

Sir Dan

Posted
Posted

I had a 94 chev cavalier that did this same exact thing. It was the torque convertor lock-up solenoid for the overdrive gear on the tranny that was bad. It would fail to release the convertor from lock and kill the engine when coming to a stop. Very common on these I guess, but not sure about any other vehicles. The overdrive will not kick in until a certain temp is reached in the tranny fluid, so that would explain the problem not happening until it heats up. Hope this helps...

arrowshooters Enthusiast

arrowshooters

Posted
  • Author
Posted
I had a 94 chev cavalier that did this same exact thing. It was the torque convertor lock-up solenoid for the overdrive gear on the tranny that was bad. It would fail to release the convertor from lock and kill the engine when coming to a stop. Very common on these I guess, but not sure about any other vehicles. The overdrive will not kick in until a certain temp is reached in the tranny fluid, so that would explain the problem not happening until it heats up. Hope this helps...

 

Makes sense, so I will add that when we pulled the engine we pinched the wiring harness between the trand and the lip on the fire wall. I pulled the sheath off and inspected the wires and found nothing wrong but maybe the wire to the Converter was damaged. Can someone with a scan tool ID this problem?

arrowshooters Enthusiast

arrowshooters

Posted
  • Author
Posted
Had the timing set on my new/rebuilt 98 5.7 today. It was pretty far off so I figured that was the cause of my engine dieing when coming to a stop. Well my engine ran a whole lot better and I thought I was out of the woods, but after awhile it started dieing again.

 

This issue does not happen when the engine is cold, only when it is up to temp and driven a little bit. I will be slowing for a stop and it just shuts off. I can pop it in neutral, start it right back up, and off I go as if nothing was wrong until the next time I slow down either for a stop or a turn. It acts like two things to me: either a huge vacuum leak (but a vacuum guage has me well in the green and I sprayed everything I could find with Brake Cleaner), or it's like I have a manual trans and slowing down without the clutch in.

 

I am sooooooooo stumped.

 

Idle air control dirty or bad? Did you adjust timing with the connector on the firewall disconnected? (I think this applies to yours)

 

 

 

I had the timing set with a scan tool. No need to mess with connector.

arrowshooters Enthusiast

arrowshooters

Posted
  • Author
Posted
I had a 94 chev cavalier that did this same exact thing. It was the torque convertor lock-up solenoid for the overdrive gear on the tranny that was bad. It would fail to release the convertor from lock and kill the engine when coming to a stop. Very common on these I guess, but not sure about any other vehicles. The overdrive will not kick in until a certain temp is reached in the tranny fluid, so that would explain the problem not happening until it heats up. Hope this helps...

 

Makes sense, so I will add that when we pulled the engine we pinched the wiring harness between the trand and the lip on the fire wall. I pulled the sheath off and inspected the wires and found nothing wrong but maybe the wire to the Converter was damaged. Can someone with a scan tool ID this problem?

 

 

Would this thing sitting for the last 3 months have anything to do with it?

superjim Senior Enthusiast

superjim

Posted
Posted
If there are no other easy checks for me, I am to the point of a trany shop or the dealer for driving diognosis. Thanks.

 

 

Just to see if it the transmission killing the engine....

go drive down the highway fast enough to have it in high gear with the converter locked.

 

Now exit on to the service road and start stopping.

When you get down to about 20 or 25 mph...slip it to NEUTRAL" and "THEN" stop.

See if it dies.

If it does..it ain't the transmission.

arrowshooters Enthusiast

arrowshooters

Posted
  • Author
Posted

I have actually done thins in town since the converter locks up around 35 or so. When I start to slow I will pop it into neutral and it will not stall. I then can put it back into drive and all will be well until next stop.

 

I am actually taking it in to the stealer tonight to have them drive it with a laptop hooked up. One possibility I guess is that the Computer could have lost it's mind from the battery being disconnected for the last 3 months. We'll see. :thumbs:

belchfire Enthusiast

belchfire

Posted
Posted

From your description; I'm betting Sir Dan nailed it. I'd heed his post.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • Core-Lokt
      Wiring Help, Please

      By Core-Lokt · Posted

      Thanks; I looked there a few minutes, and I think I can find something. I really never looked there, as I thought it was stuff like PTO/aftermarket bodies/accessories like snow plows.
    • newdude
      2 speed transfer case optional now?

      By newdude · Posted

      This is a 1/2 ton thing ONLY.  All HDs 2020-2026 have the two speed transfer case, with Autotrac as an option.     1/2 tons 2019-2026, regular 4x4s come with a single speed case (no 4LO!), and trucks with Z71 ordered, or all Trail Boss trucks come with the 2 speed case.  2 speed case is also an option on WT, and is also standard on High Country.  
    • newdude
      Different requirements for oil filters?

      By newdude · Posted

      2013 5.3 still to this day calls for the PF48 filter.  Which as a 15psi bypass pressure.     There is a TSB, 17-NA-157 that talks about the PF-63 and PF-64 filters which have a higher bypass rating of 22psi.    TSB HERE - temp.xml   "Beginning in 2012, the oil pumps began to regulate main gallery feedback instead of pump out pressure. This means that the oil pump now does not begin to regulate until pressure is built up to the main gallery. This change reduces the amount of time it takes to provide oil to the engine bearing and lifters during extreme cold start conditions.  Main gallery feedback oil pump control systems are present on the following engine families which use Spin-on oil filters: Small Gas Engine (SGE), Large Gas Engine (LGE), High Feature (HFV6) Gen2 and Small Block Gen5 gasoline engines. These engines with the main gallery feedback oil pump control systems are factory built with an ACDelco® oil filters"   It also calls out what engines use those filters.  The gen 4 small blocks were not on that list (LMG, LC9, L9H, L92, L94, L20, L96).  Gen 5 small blocks use the higher pressure filter.          That all said...   Your 7045 Napa filter is the PF63 equivalent, with 22psi bypass.  You are already using the higher bypass pressure filter.  You CAN keep using it, you don't technically have to use it though.  
    • Grumpy Bear
      Different requirements for oil filters?

      By Grumpy Bear · Posted

      Do you know WHY the filter relief setting was increased to 22 psig?    When the new system goes into the second stage the pump volume ramps up considerably. It was found that the 15 psi filter bypass setting put the filter in bypass on a warm engine when the second stage was activated. Raising the filter bypass setting forced the filter to do what it designed to do. Filter. Preventing debris from circulating during high load, high rpm operation.    So next question is how did GM find this out? VLOM/lifter failures and a deep dive by Melling Corp.    Last question. Is it required? Look at it like this; a motor may be equipped with a rev limiter. But it only works if the set point in reached. That 22 psig setting only matters if the pressure differential across the filter media exceeds 15 psig during normal warm operation. Second stage kicks in around 3000-3500 rpm.    I can't answer your question because I don't know you and how you use the truck. But I think there is enough information here to let you decide for yourself. 😉
    • Coastie05
      give me some tips to make my truck look better

      By Coastie05 · Posted

      Go back to OEM wheels. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...