Need Help with troubleshooting

[85Dodge600Turbo]

This is my first post. I have tried to post under the help section, but have not been granted access yet.

I just picked up a 33k 85 turbo. Runs out nice at part throttle, but surges and loses power when throttle is pressed more than 1/2 way.

Throwing codes 32 (EGR?) and 45 (Overboost). Not sure what to make of it.

Any help appreciated. Thanks!

[Steve in Va]

Welcome to turbododge!!!

Sounds like a well taken care of ride with only 33k.

Your symptom could be somebody changed the timing belt and could have gotten the cam one tooth off. I dont think you can post pics yet with only one post, but send me a wide digital picture (if you can see my email under my post) of the distributer area and we may be able to determine if timing is off.

[detobias]

'overboost' means the MAP sensor has detected boost pressure exceeding a setpoint;
at which point the ECM shuts off fuel to the engine,
resulting in "Overboost Fuel Cutout" .

when MAP sensor shows boost P below setpoint, ECM turns fuel back on.
this can result in a cycling:
overboost surge / fuel cutout / overboost surge / fuel cutout ...
if you keep your foot in it

on an older un used TD like yurs,
9/10 of the time its a plastic vacuum line, elbow, or connector thats leaking.
our old TDs used a lot of plastic vacuum lines which become brittle , crack, and leak.

this can be a Nightmare for driveability,
and can cause all sorts of random operating issues.

I suggest a THOROUGH inspection of all vacuum lines, connectors, etc;
replace any/all suspect...

unless you want maintain it as stock appearance,
I further suggest replacing all original vac lines with new vac line,
auto stores & hardware stores carry it by the foot in numerous inner diameters,
aftermarket also offer 'silicone' vac lines if yu prefer (or want a color)

[NAJ]

Welcome To TD!!!

Just to add to what was already stated above which was very through,
Splicing the plastic lines with rubber hose usually results in more leaks and more driveabilty issues.(Experiance Speaking)
FYI...Overboost Shutdown is supposed to protect your engine from going Lean and causing Detonation and Internal Damage but....
Overboost Shutdown if prolonged Is Damaging To The Engine, Blown Headgaskets, Broken Pistion Ring Lands, etc.

Other causes of overboost shutdown would be...
Fault in Wastegate Solenoid Circuit
Stuck Wastegate

I will PM you the Code 45 diagnostics.

INSTALLING A VACUUM BLOCK
http://www.turbododge.com/forums/f4/...-93-turbo.html

HEAD GASKET DAMAGE FROM OVERBOOST SHUTDOWN

[85Dodge600Turbo]

Thanks-
I looked the engine over thoroughly last night and compared the vacuum lines to the schematic underhood. They are all spot on. Rubber is not dried out either. I jut sold an 86 Lebaron turbo with 119k that I owned the past 5 years, so I know the look of a patched up vacuum system.

Funny thing with the car is that it drives just fine with no running issues at part throttle.
I'll keep my foot out of it until I figure out the issue.

Car was garage kept by an old man, but did exhibit signs of light accident damage in the pass. quarter. Front end is straight as an arrow.

Car came with a very greasy Clymer manual. Not sure if this was second hand, or an indication of a shadetree mechanic:)

I'll snap a shot of the engine compartment tonight. May have had a timing belt installed?

Thanks-

[NAJ]

Did you get the Code 45 diagnostics I sent you thru PM?

[85Dodge600Turbo]

Quote:

Originally Posted by NAJ Did you get the Code 45 diagnostics I sent you thru PM?

Yes, Thanks!
Just short of time during the work week.
I'll probably get back into it this weekend.

Just located a set of 15" 84 Laser rims.
(Car really wallows around with the stock steel 14")
I had a used 84 Laser XE turbo back in 86. Black w/silver stripe.
That's the one that got me hooked:)