Warm start issue

[Jeff K]

Restoration is almost complete on 16245!

I am having one issue.

It cold starts fine. It hot starts fine within 30 minutes, when the accumulator is holding pressure.. (from what I read anyway)

It seems to have issues between the time the accumulator gives up and the cold start value engages. It cranks for a while (10-20)seconds. It always starts, but it labors to start. It runs and drives fine after that.

We replaced all hoses, fuel system parts (accumulator, pump, injectors, rebuild fuel distributor). All cooling systems parts and hoses. Rebuilt the intake.

Otherwise it runs perfect. It seems to be a fuel pressure issue.

Any suggestions?
Thanks
Jeff

[Bitsyncmaster]

You need to find out if your still holding rest pressure when you have the start problem. Your description is not common to the warm start issue. Very hard to start if ever and it will run like crap for 20 to 30 seconds is the warm start problem.

[Jeff K]

You need to find out if your still holding rest pressure when you have the start problem. Your description is not common to the warm start issue. Very hard to start if ever and it will run like crap for 20 to 30 seconds is the warm start problem.

Actually Dave, you pretty much summed it up. It does crank for 10-20 seconds, then kinda sputter up. Again it always starts, after that it's fine. I'm a total noob, how do I check the rest pressure? Thanks!

[Bitsyncmaster]

Actually Dave, you pretty much summed it up. It does crank for 10-20 seconds, then kinda sputter up. Again it always starts, after that it's fine. I'm a total noob, how do I check the rest pressure? Thanks!

You can verify how long you hold rest pressure by removing the air cleaner, start the car, shut it off and do a light tap on the air plate. Do not press it down just keep checking that it does not go down and timing how long it takes to loose pressure.

On my car, in the hot summer I have to hold pressure for 4 hours or longer to prevent a warm start issue. After 4 hours the engine has cooled off enough it won't cause a problem.

[Jeff K]

You can verify how long you hold rest pressure by removing the air cleaner, start the car, shut it off and do a light tap on the air plate. Do not press it down just keep checking that it does not go down and timing how long it takes to loose pressure.

On my car, in the hot summer I have to hold pressure for 4 hours or longer to prevent a warm start issue. After 4 hours the engine has cooled off enough it won't cause a problem.

Thanks Dave, I'm going to try that! It's been brutal hot where I live, like 105 yesterday. (So cal valley desert - uugghh)

[jmrydholm]

That's similar to what I've got going on with #10715. To top that all off, my starter itself decided to grate and buzz, like it wasn't catching the gear on the trans properly. I started it up right away after a few tries (the weather here is nice and cool tonight.) I'm going to make time to get under there and tighten the starter down- it's a rebuilt one with a brand new DMCH solenoid on it. Maybe it shook lose or something

I'm getting paid this week, so I'll pick up an accumulator and put it on as well as the O-rings. That will do me an entire fuel system replacement, sans the tank itself. Sometimes, I think that Murphy's Law guy possessed my car.

[David T]

You need to check your rest pressure, control valve pressures (the CPR) and the Thermo-time switch. Something in those systems is not working right. Do the plug swap and see if that gets it to start right up.
David Teitelbaum

[Jeff K]

You need to check your rest pressure, control valve pressures (the CPR) and the Thermo-time switch. Something in those systems is not working right. Do the plug swap and see if that gets it to start right up.
David Teitelbaum

I appreciate the response David. The CPR is new, not sure about the Thermo-time switch.

Can you send or post a link for the "plug swap"?

Thanks
Jeff

[David T]

You pull the plugs off the Cold Start Valve and the Control Pressure Regulator. You put the plug that went to the CPR onto the CSV and start the car. As soon as it starts you run back there and replace the plugs to where they originally went. You CANNOT leave the CPR plug on the CSV. This forces the CSV to run constantly. If this works the Thermo-time switch or the wiring is not right and/or the rest pressure is not holding long enough. Should get a warm-to-hot motor running.
David Teitelbaum

[jmrydholm]

You pull the plugs off the Cold Start Valve and the Control Pressure Regulator. You put the plug that went to the CPR onto the CSV and start the car. As soon as it starts you run back there and replace the plugs to where they originally went. You CANNOT leave the CPR plug on the CSV. This forces the CSV to run constantly. If this works the Thermo-time switch or the wiring is not right and/or the rest pressure is not holding long enough. Should get a warm-to-hot motor running.
David Teitelbaum

Interesting, I've never swapped the plugs before. I was able to start 10715 up right away last night as it was cool out. I ran the engine for about 20 minutes. I think I'll drive her around town a bit and try the plug swap after about 15 minutes after shutting it off, then listen for the accumulator "popping" noises. I've had this car since '04 and I'm still learning about it. Thank you from me as well, David!

[lorentbj]

I am going through the same with D 6341 -Warm start issue--I just posted a thread.I will let you know if I come up with anything.I do not get to it every week.Post anything you check or try. later,bob