Well the Blazer troubles continue.

As said before it's a 1994 Chevy Blazer 6.5L TD. Fixed the crappy running syndrom with a PMD. Fixed it until last week. Started to run really rough again. Blowing white smoke all the time and otherwise what seemed like missing in one cylinder. It had these codes:
36: Injection Pulse Width Error(response time long)
94: Cylinder Balance Fault #5

It also had a balance fault on either 3 or 4(don't remember). I played around with it for a while and found that when cold, it ran perfect. Once it was hot it ran rough again. Blew tons of white smoke whenever you turned off any cylinder. So I think about it for a few days. And assume possibly a failed injector...thinking it might be hanging open. We ordered 2 sets of new delphi's from the big ol' auction sites.

Fast forward to today. We pulled the truck apart. Changing glows and injectors. Before putting it back together we decided to start it(yes, it was loud) and see if that fixed the problem.

It didn't...With the turbo off white smoke pours out of the manifold like a locomotive. Tracked it down to cylinder 6. When the injector line is loosened it runs alot better.

Here's the wierd part. The compression tester claims it has no compression in the cylinder(I checked it with the ECM fuse pulled). Then left to get angry somewhere else and forgot about the tester. Accidentally started it with the tester in there. It claimed 500 psi in the cylinder.

Could it be the intake valve is sticking closed, not allowing it to get any oxygen. Possibly a collapsed lifter causing this? I also know that it could be the Injection Pump, althought I'm not quite ready to admit that.

Anyone chime in here and see what I'm missing?

Thanks alot!
Jay

sounds to me like the head gasket might be blown between cylinders.

Radiator hose getting hard before engine warms up, or bubbling over coolant tank are indicators of head gasket... however, those little dollar-something pieces of plastic (valve retainers) may give you similar results.

The radiator hose isn't getting hard on cold start. Also, it sometimes fires on that cylinder. Fires about 5 times, misses 10, fires 3, misses 5. And I kind of lied. It's more a whitish blue with black mixed in spurts.

I think in the morning the valve cover is going to come off and the valve train will be examined. I would really like to get this thing reliable again. It's got 1000km in the past 6 months due to stuff like this.


Good news is that I got my 4" warpspeed exhaust and crossover earlier today! :D Although, the stainless tip is missing and the reciept said it was sent. Hmpf. ;)

Jay

Alright here's an update:
Finished seeding in the rain the other night so back to work on the Blazer.

Injectors are in.
It's reassembled.
Still blowing some whitish blue smoke on light throttle.
WOT just some black smoke, and alot of power.
Random clunking coming from the cylinder.

At moderate throttle there is some white smoke and you can feel it miss somewhat. However once the turbo spools up when you put your foot in it runs great. Makes more power than I can believe.

There is absolutely no blowby anywhere on the engine cold or warm.

Could the cylinder have build up in it making it miss and other stuff?

It's been run for about 25 minutes with the new injectors now and has been warmed up fully.

I wrote this in a hurry so it might not make much sense. I ask anyone to inquire! :)

OK. I finally got the video done!

Here is when it was still apart after the injectors:
http://www.youtube.com/watch?v=Kb0t-Vc1Sho

Here it is back together after a few hundred clicks. It's got a wierd sound to it that I can't describe.
http://www.youtube.com/watch?v=S1PAC26wiKc

I'm thinkin maybe lifter, but can a pump do this?

Thanks in advance!
Jay

I little hard to tell from the video but is there compression coming from the intake manifold or the egr valve, if its the intake then maybe a bad intake valve? or blown headgasket like Scrufdog said.

I can't get the second video to work.

That's coming from the EGR. Sorry about the quality, truck was a bit louder than we expected. :p: The second video worked once for me, but now I can't get it to work again.

There are no bubbles in the overflow and the rad hose doesn't get hard at all. After running it a few times that started to clear up. The injector line was loosened just before the smoke quit, in case anyone can't tell.

BTW: With the second video it's hard to see or hear what's wrong. The quality went down big time from before.
The problem with it is you can still hear that missing sound coming from cylinder 6, I believe. It's also still smoking at just above an idle, but stops at about 1700 rpm.

There is a possibility of a cracked ring, or like mentioned before, headgasket. If headgasket is the culprit, I recommend tossing the old head bolts and installing ARP headstuds, and a marine style headgasket. Marine headgaskets are a little thicker, which will give you longevity.

If you have a bad ring, then find a good reman from a respectable vendor.

Have you checked the plastic retainers on the valvetrain. I hope its that easy for you.

Sorry that you havent been able to get it running, and I hate to be one of the bearers of bad news.

Hope you get her goin,
Tony