Have u replaced your glow plug controller? I was a mechanic in the army and changed many glowplug controllers, and maybe one set of plugs. I usually worked on hummers, but I think the blazers had identical 6.2 in em.
I switched to a manual glow plug control. Just a relay with a button on the dash. I put in new glow plugs sunday. Still crazy hard to get to start by cranking. 1/3 second spritz of ether and she jumps up and idles. A friend helped me adjust the timing yesterday. We set it to 8.5 degrees. No noticeable difference in operation. I think the injector pump is just worn out. It is 26 years old.
Theres a stanadyne dealer/service center on Broadway here in St. Louis so I'm going to give them a call and see what they think and what sort of services they offer. It says they do repair and rebuild.
The only thing I was confused on was that the scribe marks were totally matched. I expected we needed to advance the pump a little. I think what we did though was set it back to spec timing. He rotated is toward the passenger side about the width of three dimes and said that it was 8.5 degrees. Everything I see says that advance is toward the driver side. Anyone know for sure?
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1986 M1009 CUCV K5 Blazer 6.2 IDI Diesel
St. Louis, MO
yeah, a worn out pump is the most likely culprit. you could run it on straight pump fuel to be sure. it should start worse on pump fuel if it is a worn out pump. or you could run a thicker blend, and it should start better. my db2 is also worn out. it will not warm start at all (not even close) on pump fuel. pour a little water on it, and it fires right up instantly. my 50/50 mix is a little thicker than pump fuel. it always starts perfect with the mix (hot, warm, or cold). my pump is only 19 years old.
thanks for that web link. $255 is a decent price i would say. they want $450 to rebuild my db2. not sure why. must be more parts inside the later db2s. i'm gonna have to start saving my pennies.
Well I ruled out the last possibility. I did an annotated compression test tonight. I could only get the harbor freight tester to connect to the four gp ports on the driver side. The adapter had interference on the passenger side from the exhaust manifold. In any case I read 400 and change on all four cylinders and thats using to different pressure gauges because one of them stopped working halfway through and I had to take the gauge off the other one that broke on sunday to make one working tester.
So I've ruled out everything. I feel fully comfortable in my analysis that it is the %100 injector pump. Oh yeah. And the glow plugs I installed last sunday? every tip was melted off. So there's another $70 down the toilet. Based on what I read that when the IP goes it will start melting glow plugs because the timing is off and more heat is being held in the cylinder or they are getting sprayed down with fuel at the wrong time and melt away when the fuel catches instead of it catching while atomized.
In any case, mystery solved.
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1986 M1009 CUCV K5 Blazer 6.2 IDI Diesel
St. Louis, MO
Checked my fuel pressure last night. 8.5 psi feeding into the injector pump. Gauge only goes to 10. That was a idle. I didn't bother revving the engine. Anyone know what a fualty CDR valve would do? stuck open or closed conditions?
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1986 M1009 CUCV K5 Blazer 6.2 IDI Diesel
St. Louis, MO
Well heres the continuing saga. Dropped my truck off to have the IP replaced. My mechanic pulled the intake manifold to do it (not how I would have done it). Called and told me the rear drivers side cylinder was full of coolant. Don't ask me. It was running fine and only had low power and needed ether to start. In any case I can't afford to have him chase this and repair it so I'm towing it to my buddies shop and gonna tackle this myself. Found a rebuilt set of heads for $200. Gonna pull both heads, clean it all up, install ARP head studs and throw these new heads on. Heres hoping I don't find a cracked block when I lift em off. Then it will get the new IP. What an odyssey
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1986 M1009 CUCV K5 Blazer 6.2 IDI Diesel
St. Louis, MO
Wow. It's been a long time. Just finished some major maintenance.
Replaced IP with a DB2 4523 1.2c milspec pump. Had the heads rebuilt (no cracks), disassembled and cleaned my injectors with my ultrasonic cleaner, checked chain tension (like new), put on a new harmonic balancer, replaced the water pump, new glow plugs, refilled with fleet charge coolant and an oil change.
It's running good now. I need to set the idle and check the timing still. It's 60 degrees and it takes about 3s on the glow plugs to start. Gonna start a batch of oil tomorrow.
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1986 M1009 CUCV K5 Blazer 6.2 IDI Diesel
St. Louis, MO
Wow. It's been a long time. Just finished some major maintenance.
Replaced IP with a DB2 4523 1.2c milspec pump. Had the heads rebuilt (no cracks), disassembled and cleaned my injectors with my ultrasonic cleaner, checked chain tension (like new), put on a new harmonic balancer, replaced the water pump, new glow plugs, refilled with fleet charge coolant and an oil change.
It's running good now. I need to set the idle and check the timing still. It's 60 degrees and it takes about 3s on the glow plugs to start. Gonna start a batch of oil tomorrow.
Good job! and thanks for the update.
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5 out of 4 people have trouble with fractions.
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