Question: 94 Chevy Suburban stalling, problems idling and dificulty to start engine. - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 07-09-2018, 05:37 PM   #1 (permalink)
san15895
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94 Chevy Suburban stalling, problems idling and dificulty to start engine.

Hi, as I said in the title, Im having some problems with my 94 suburban.

First thing Im concerned about is that today I could finally start my engine changing my PMD. I have it relocated but still the one that was in the truck stopped working. What could cause a relocated PMD to fail?

Second, sometimes the truck runs great, but suddenly it stalls and after i can start it, it idles badly. Feels like RPM's are fluctuating and it loses power. It feels amplified when I put transmission on D or R.
Here is a video showing how it sounds (there is other truck on because my batteries were down and I used some cables). Its not very clear in the video, but i hope you get it.


Im getting codes 17, 18, 29, 35 and 36 by the SES light blinking.

Help me please!


Last edited by OkDually; 07-09-2018 at 05:40 PM. Reason: fixed video link
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Old 07-09-2018, 05:45 PM   #2 (permalink)
OkDually
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Welcome to DieselPlace
Start by changing the fuel and air filters. Also, make sure the small filter screen down inside of the bottom of the fuel filter manager is clean as well.

Go through all of your grounds: https://www.dieselplace.com/forum/sh...d.php?t=163087

Remove each ground, clean the contact points and re-install. Replace any ground wires that are in bad condition.

Perform a lift pump test: https://dieselplace.com/forum/showthread.php?t=39350
If the lift pump fails the test, be sure to replace the OPS ( Oil Pressure Sensor) as well.

Install a clear piece of fuel line on the return side of the Injection Pump to help locate any air in fuel gremlins:
https://www.dieselplace.com/forum/63...ml#post7305306

__________________
1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club


Last edited by OkDually; 07-09-2018 at 05:46 PM.
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Old 07-09-2018, 05:58 PM   #3 (permalink)
san15895
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Quote:
Originally Posted by OkDually View Post
Welcome to DieselPlace
Start by changing the fuel and air filters. Also, make sure the small filter screen down inside of the bottom of the fuel filter manager is clean as well.

Go through all of your grounds: https://www.dieselplace.com/forum/sh...d.php?t=163087

Remove each ground, clean the contact points and re-install. Replace any ground wires that are in bad condition.

Perform a lift pump test: https://dieselplace.com/forum/showthread.php?t=39350
If the lift pump fails the test, be sure to replace the OPS ( Oil Pressure Sensor) as well.

Install a clear piece of fuel line on the return side of the Injection Pump to help locate any air in fuel gremlins:
https://www.dieselplace.com/forum/63...ml#post7305306
Thanks for your reply. Im form Argentina, and i dont have easy access to any parts. Recently I ordered the speed sensor and the VSSB and it took almost 2 months to get here.

This is why I want to diagnose the exact problem first.

Now, I have cleaned my fuel tank and all the circuit a month ago. Still, I have the clear fuel line in the return of the IP with a big buble of air.

I will check all grounds asap and the lift pump as well.
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Old 07-09-2018, 06:06 PM   #4 (permalink)
OkDually
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Quote:
Originally Posted by san15895 View Post
Thanks for your reply. Im form Argentina, and i dont have easy access to any parts. Recently I ordered the speed sensor and the VSSB and it took almost 2 months to get here.

This is why I want to diagnose the exact problem first.

Now, I have cleaned my fuel tank and all the circuit a month ago. Still, I have the clear fuel line in the return of the IP with a big buble of air.

I will check all grounds asap and the lift pump as well.
If you have the clear line still installed and see a large bubble of air then you have an air in fuel issue to look for as well.

There should be no air bubbles in the clear line.
Here are some links to help you locate air in fuel:
Where Are The Likely Locations For Air: https://www.dieselplace.com/forum/63...ml#post4047002

How to Find Air Leaks: https://www.dieselplace.com/forum/63...ml#post6929258

How to pressurize the fuel system to hunt for air leaks:
https://www.dieselplace.com/forum/63...ml#post7603650
__________________
1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club

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Old 07-09-2018, 06:08 PM   #5 (permalink)
san15895
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Quote:
Originally Posted by OkDually View Post
If you have the clear line still installed and see a large bubble of air then you have an air in fuel issue to look for as well.

There should be no air bubbles in the clear line.
Here are some links to help you locate air in fuel:
Where Are The Likely Locations For Air: https://www.dieselplace.com/forum/63...ml#post4047002

How to Find Air Leaks: https://www.dieselplace.com/forum/63...ml#post6929258

How to pressurize the fuel system to hunt for air leaks:
https://www.dieselplace.com/forum/63...ml#post7603650
Well, yes, I do have an air problem then. Ill work on this next time i have some free time.

Thanks for your replies again! Ill keep you posted on any advances.
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Old 07-09-2018, 06:13 PM   #6 (permalink)
jnlperformance
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Do you have an acdelco fuel filter? (That's really the only filter you should use because the air bleeder valve works properly on those)

Anyway...

Good way to test lift pump and bleed air at the same time...

Use a clear plastic hose... attach to nipple on air bleed valve on fuel filter located at rear of engine towards firewall. Put the other end in a jerry can. Twist the bleeder open and purge the air out of the fuel system. Open the valve only with the motor running... you'll see the air bubbles leave... and if the motor stalls while your attempting this... the l.p. is bad. Replace with acdelco l.p. only.
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I'll get back to this later...
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Old 07-09-2018, 06:14 PM   #7 (permalink)
jnlperformance
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Motor just sounds like it has alot of air in the fuel system. And don't rev the motor cold... well I wouldn't at least..
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94 2Dr Blazer 6.5L
AMG506 Optimizer Block
Peninsular Forged Rotating Assembly
18:1, soon to be 16:1
Arp Head / Main Studs / Girdles

I'll get back to this later...
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Old 07-09-2018, 06:17 PM   #8 (permalink)
jnlperformance
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This guy here....

I totally agree with what dually said as well... follow those instructions...

As for the codes... after you do all that clear them... see what comes back (if they come back) and post the results...
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__________________
94 2Dr Blazer 6.5L
AMG506 Optimizer Block
Peninsular Forged Rotating Assembly
18:1, soon to be 16:1
Arp Head / Main Studs / Girdles

I'll get back to this later...

Last edited by jnlperformance; 07-09-2018 at 06:17 PM.
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Old 07-09-2018, 06:52 PM   #9 (permalink)
san15895
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Quote:
Originally Posted by jnlperformance View Post
Do you have an acdelco fuel filter? (That's really the only filter you should use because the air bleeder valve works properly on those)

Anyway...

Good way to test lift pump and bleed air at the same time...

Use a clear plastic hose... attach to nipple on air bleed valve on fuel filter located at rear of engine towards firewall. Put the other end in a jerry can. Twist the bleeder open and purge the air out of the fuel system. Open the valve only with the motor running... you'll see the air bubbles leave... and if the motor stalls while your attempting this... the l.p. is bad. Replace with acdelco l.p. only.
As I said, here in argentina its difficult to get access to those parts. I could order an acdelco fuel filter, air filter, etc. But I want to make sure that i dont have to order anything else haha.

I will try to solve the air problem first, then I will be able to go for other problems.

Thank you! I will test the LP and let you know.
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Old 07-09-2018, 06:53 PM   #10 (permalink)
san15895
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Quote:
Originally Posted by jnlperformance View Post
This guy here....

I totally agree with what dually said as well... follow those instructions...

As for the codes... after you do all that clear them... see what comes back (if they come back) and post the results...
How can I clear the codes? I did it once but dont know exactly how haha.

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