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Not start after replaced IP.

valyidol

valyidol

Active Member
Messages
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Location
Russia, Moscow
Hi!
My friend from Kazan bought a tow truck Chevy Silverado 3500 1994 6.5 turbodiesel.
Under the hood was IP DB2 but engine worked not so good. Sometimes truck rans well, sometimes not accelerated. And automatic transmission don't work correctly. My friend asked me to replace the pump and install DS4. All wiring for the DS4 has under the hood, and I have a good pump and PMD. I installed the IP and connected all connectors and began to cranking to remove the air. No result! Shut-off solenoid works, lift pump works but no fuel in injectors. What could it be?
On the engine is not original fuel filter and is not t-valve. From filter is dripping fuel, I think the seal is bad.
 
We typically go the other way getting rid of the unreliable PMD setup for the DB2 mechanical pumps. :suicide:

I assume you pulled the entire timing cover and put a CPS, crank position sensor, equipped timing cover in?

You should fix the fuel and "air" leaks. the GM manual starts with checking for and eliminating air leaks. The second the lift pump stops a fuel leak becomes an air leak.

PDF of voltages and other info for the DS4 system here:
http://www.thetruckstop.us/forum/sh...ge-DS-6-5-DB2-5-7L-info-online-from-Stanadyne!
 
Wow db2 out and ds4 in?!? yeah :iagree:

Pull the glow plugs so you can crank engine easily and know when you get fuel by the mist coming out the gp holes. Now chase all the electrical problems. Look for bent pins in the fsd connections. Test fsd on another 6.5 to verify it is good. Please list all the electrical components added and adjusted so we know you have it all and timing is correct.
 
Ha!
This truck is some more truble! I think about automatic transmission. The engine is run but truck dasn't to do it! The truck runs up very slowly
 
Transmissions are different for some years. This is specific to the Torque Converter Lockup clutch solenoid, trans line pressure control, and a few other things.

Why did a 1994 have a DB2 pump?
Is this the original transmission and engine?
What did you do to the ECM to swap over to the DS4 pump - the transmission may not like this ECM or PROM chip change due to model year design differences.
 
Possible only 2nd gear? With a db2 ip, the engine speed sensor (also oil pump drive) Has 2 wire connection. This feeds information to the transmission control module. When you change to a ds4, the transmission is controlled differently.

What did you do to change the transmission control when you swapped to the ds4? IF and I repeat IF that is the problem talk to Leroy's Diesel about a controller, he sells the one to get.
 
WarWagon said:
Transmissions are different for some years. This is specific to the Torque Converter Lockup clutch solenoid, trans line pressure control, and a few other things.

Why did a 1994 have a DB2 pump?
Is this the original transmission and engine?
What did you do to the ECM to swap over to the DS4 pump - the transmission may not like this ECM or PROM chip change due to model year design differences.
Click to expand...
Transmission 4L80e. I think this is original transmission.
I do not know why there was DB2.
Today I drove about 100 km. Sometimes works all gears but high engine speeds. Sometimes works only 2nd gear. I also think that the engine is not power. Possible the chain is stretched.
This truck was much trubles whis wiring. The connector OBD was cut! I can not to scanned it!
 
Will L. said:
Possible only 2nd gear? With a db2 ip, the engine speed sensor (also oil pump drive) Has 2 wire connection. This feeds information to the transmission control module. When you change to a ds4, the transmission is controlled differently.

What did you do to change the transmission control when you swapped to the ds4? IF and I repeat IF that is the problem talk to Leroy's Diesel about a controller, he sells the one to get.
Click to expand...
No, thank you. I think than I need to replace the tim kit and install connector OBD and scan code. After that I'll think what to do. Is it ok?
Yes, sometime only 2nd gear!
 
The sometimes only 2nd gear is the transmission going into a safety mode known as "limp mode". There are multiple things that can cause it, most common is loss of power from ignition switch to tcm and loss of engine speed (rpm) to ecm.

misspelling or loss in translation on "tim kit"

Was the transmission working properly with the other IP?
 
:nonod: You have entered a nightmare of electronics and you do not know what you have to start with.

Who knows what GM did for stuff delivered to your country. I assume it should have a electronic DS4 pump as GM used them in 1994 due to the EPA in the USA. But, it could have had a DB2 for 1994 for the country it was delivered to. This may be the reason the ALDL OBD connector wires were cut.

Quit throwing parts at it until you know what is wrong with it. It just wastes time and money and doesn't fix it. You waste time with the "engine timing chain" as these stretch out quickly and can have nearly an inch of slop before they are out of spec.

Did you replace the Electronic Control Module, ECM, when you swapped the DS4 pump in?

Can you open the ECM cover and post up the code printed on the blue PROM chip under the cover? Should be four letters.

What model of DS4 did you put in?

The Computer, ECM, is NOT HAPPY. The ECM is protecting the engine and transmission when it locks into 2nd gear because something isn't working properly.

Does it have a "Service Engine Soon" orange lamp or a "Service Throttle Soon" light that comes on during a bulb test? Do the orange warning lights stay on or shut off with the engine running?

You need to read codes out of the ECM, computer. You can't figure out what is wrong without knowing reading the codes out.

the codes could tell you exactly what is not working and the computer could be cutting fuel, power, to save the engine.

You will need to do a Timing Offset learn procedure so the computer knows where the IP and crankshaft are. Timing is a huge power loss factor.

The 6.5 engine with a stock program, chip, tune, or whatever you want to call it, is lacking power. The engine will feel like it has no power. The DB2 pump you removed likely had the fuel turned up and timing advanced for better engine power than the DS4 you put on. You have to get a different tune (PROM chip) for power. But this is only after it is working properly.

It is possible you have a fuel supply restriction or air getting into the fuel lines. Plugged tank sock, bad Oil Pressure Switch to run the lift pump, air /fuel leaks in the fuel lines.

How many miles on the injectors? They need to have new nozzles put on every 100,000 miles or less.
 
Oh! Thanks for the many words!
Sometimes ago this truck had DS4. It is 100%. Old wiring and ECM and electric pedal with homemade cable says about it. But the old owner used this truck in the provincial mountain village, which has no parts for amerikan cars. I think he installed DB2 and didn't think about transmission control module. Old owner is dead. We can not to ask him "why"? New owner ask me about help. "Install the electric IP" - he say to me. "OK. I have good condition IP and PMD" - I say.
(Sorry for my english...)
I swaped IP and PMd from GM Yukon 1995. There is realy good condition. I know that. I don' remember which model of IP. ECM is original 1994 year. The lift pump I conected with reley to insignion switch.
You are right about diagnostic. I'll do it tomorow.
 
ECM's are nearly all the same esp for the OBDI years. It's the PROM chip that matters. The PROM, Programmable Read Only Chip, may need a change to match the IP as the other linked thread discusses.
 
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