I think I found the problem!

dgoodhue

dgoodhue

BuSTeD 4.3
Re: I think I found the problem!

Epstyphoon303 said:
Dave Thanks I guess ill find out more when I do a proper leak test!!
And yes in my last post I thought I was having low boost or lack of! After installing a boost gauge I discovered boost was actually dropping off around 8-9 psi.
Click to expand...

8-9 psi is base boost. What do you have for a chip? The stock injector Ultimate will basically read 8-9 for 4-5 seconds with the stock wastegate rod alignment.

What does scan tool say for wastegate duty cycle when this happening? I wonder if you have an open in the boost control wiring?
 
Epstyphoon303

Epstyphoon303

1992 Typhoon #2019
Re: I think I found the problem!

Here is whats inside..
IMAG0493.jpg


IMAG0494.jpg
 
Epstyphoon303

Epstyphoon303

1992 Typhoon #2019
Re: I think I found the problem!

Ok so I'm on the road now and with the boost solenoid unplugged I can only make 6lbs and it seems to slowly bleed off
 
Epstyphoon303

Epstyphoon303

1992 Typhoon #2019
Re: I think I found the problem!

I just installed a new one.. Ive glanced at some wastegate adjustment threads but that was before I installed the new one. Any suggestions?
 
Epstyphoon303

Epstyphoon303

1992 Typhoon #2019
Re: I think I found the problem!

Doin a search now but don't understand the 1/2 hole over lap? Im guessing with the wastegate flap closed I would line up the rod half a hole over from the flap??
 
BoostedSUV

BoostedSUV

Active member
Re: I think I found the problem!

Epstyphoon303 said:
Doin a search now but don't understand the 1/2 hole over lap? Im guessing with the wastegate flap closed I would line up the rod half a hole over from the flap??
Click to expand...

Half a hole short of the flap. You want to have to pull the waste gate rod out in order to get it on to the flap. You want some pressure holding the wastgate closed or you will get a boost leak.

Another thought, perhaps your Cat is plugged up? I chased the same issue years ago and it turned out to be a clogged catalytic converter.
 
Epstyphoon303

Epstyphoon303

1992 Typhoon #2019
Re: I think I found the problem!

When I got the ty it had a new catback exhaust. Looks like 2.5 and it has a cheap chambered muffler I plan on a new 3" cat back and I'm going to replace the cat aswell. Also when I bought the truck it pulled very hard and did not have this issue. List of things I've done include, Accel cap and rotor with brass terminals, Yellow Acell 8mm wires, Delco CR42ts plugs .35 gap, New vac lines, New wastegate, Hotwired Shur flow ic pump, removed metal ic lines, egr delete not with block off plate just unplugged, new turbo to ic hose, New boost control solenoid, New lines to and from boost solenoid, CAI with K&N, Fuel filter. Always run 91octane, Castrol edge full syn, Since ive had it, it makes a whine under boost I checked and one fin on turbo is slightly bent.!!! 150k on the clock.
 
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Throws

Throws

Active member
Re: I think I found the problem!

I'm pulling my cat this weekend chasing down my own version of this problem....I've narrowed it down to: broken WG actuator... or a clogged cat.

-P
 
Throws

Throws

Active member
Re: I think I found the problem!

Quadrajet72 said:
OK. both you guys are taking too long, and having too much trouble figuring these issues out. This isn't rocket science. The boost control system is very simple. In both cases, I believe both trucks were running correctly, you worked on them, and now they don't boost. You worked on it, and now it doesn't run right. That should tell you where to look straight away.

I had a Ty with a plugged cat. It would run at 8psi base boost just fine. But when I hooked the system up, it would over-shoot 15psi, fall on its face, CEL would illuminate (Code 31) and the engine would die. It would always restart, run rough for a few seconds, then smooth out and run like nothing was wrong until I got on it again. Rinse and Repeat. It drove me nuts for weeks, BUT I was getting OVERboost, not no-boost. I doubt it's the cat.

Hey 303: You sure you grounded the correct relay when you "hot wired the IC pump"? If you hot wired the boost relay (which is right next to the IC relay), you will only have 8 psi.

PR, I don't know what to suggest. You seem to be further along eliminating things. but that you haven't checked your waste-gate actuator yet, is probably a good thing to do next.

DaveP
Click to expand...

I'm going to relent and try that this weekend... or maybe tonight. I've got a boost gauge to hookup, so I guess it's as good as time as any to pull the fender liner out.

Are there really cases where the WG rod was off by that much?

Rocket science? No. But for someone who's only had the truck a few months, it's damn confusing.

-P
 
Throws

Throws

Active member
Re: I think I found the problem!

Quadrajet72 said:
...In both cases, I believe both trucks were running correctly, you worked on them, and now they don't boost. You worked on it, and now it doesn't run right. That should tell you where to look straight away.
Click to expand...

OK... well and good if I'm the grease-monkey who FUBAR'd it to being with. All I'm doing is trying to un-FUBAR the whole damn thing. Let's keep this whole thing moving in a productive direction...

-P
 
Throws

Throws

Active member
Re: I think I found the problem!

As an aside... after this I have to fix: springy/bouncy suspension and an inoperative ABS system. Like I said, FUBAR'd.

-P
 
Epstyphoon303

Epstyphoon303

1992 Typhoon #2019
Re: I think I found the problem!

PR1975 said:
Rocket science? No. But for someone who's only had the truck a few months, it's damn confusing.

-P
Click to expand...

Thanks exactly what I was thinking!!!! We are all here to help eachother out. Some more then others!! I appreciate all the help and how to learn from mistakes and this site!
 
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