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Engine - General, Exhaust & Induction Topics about the general engine items, exhaust system discussed here & Improving the intake tract - air filter to intake valve.

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Old 02-25-2013, 10:24 PM   #1
Need Help with troubleshooting  
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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!
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Old 02-26-2013, 06:54 AM   #2
Re: Need Help with troubleshooting  
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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.
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Old 02-26-2013, 06:55 AM   #3
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detobias is keeping our cars running
'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)
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Old 02-26-2013, 08:08 AM   #4
Re: Need Help with troubleshooting  
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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
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Old 02-26-2013, 10:21 AM   #5
Re: Need Help with troubleshooting  
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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-

Last edited by 85Dodge600Turbo; 02-26-2013 at 03:27 PM..
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Old 02-27-2013, 05:37 AM   #6
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Did you get the Code 45 diagnostics I sent you thru PM?
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Old 02-27-2013, 07:44 AM   #7
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Quote:
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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:)
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Old 12-30-2013, 10:12 AM   #8
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Finally got around to working out the issues w/this car.
The turbo over boost was caused by a previous owner disconnecting the main vacuum junction and reconnecting it the wrong way. Found the trouble by blowing compressed air through both ends of the waste gate actuator line.
Also repaired front left and right rear window regulators.

Thinking about raising boost now. Looked at FWD Performance site.
Should I pick up a recalibrated ECM or just a g-valve?
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Old 12-30-2013, 10:24 AM   #9
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What are you planning on raising boost levels to?
Are you intercooled?
You have to be sure your fuel system and other supporting systems(engine mechanical/ignition/cooling system can keep up with the increased boost or you will be repairing engine systems.
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Old 12-30-2013, 01:11 PM   #10
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Was hoping to boost within the specs of the stock ECM. This car was pulling hard with the 14psi (waste gate had inadvertently been unhooked).

My question is whether it is safe to push boost up to threshold (14) with a manual boost control valve and stock ECM,

or do I need to order a recalibrated ECM like those offered at fwd performance.


I'm willing to leave well enough alone if it will ruin the engine.
Not looking to race, just get more pick-up leaving the light.
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Old 12-31-2013, 06:24 AM   #11
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Quote:
Originally Posted by 85Dodge600Turbo View Post
Thinking about raising boost now. Looked at FWD Performance site.
Should I pick up a recalibrated ECM or just a g-valve?
glad you got 'er fixed :)

I would suggest starting with an MBC set at about 13 psi,,
this will give you a bit of (psi) room to accommodate occasional 'transient' overboost..
and will give you some extra power over the stock 9psi,
while staying safely within the limits of your stock fuel system.

I also suggest a fresh fuel filter and (at least) a 30$ narrow band A/F gauge so you have *some* idea what your A/F is doing while at WOT.

It also makes a good troubleshooting / engine monitoring tool.
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Old 12-31-2013, 08:15 AM   #12
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IMO a narrow band A/F guage is a waste of time. It makes a pretty light show but does little to actually help you keep your A/F in check. You can pick up used widebands for decent prices all day long on Ebay or used off forums.
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Old 12-31-2013, 10:53 AM   #13
Re: Need Help with troubleshooting  
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Quote:
Originally Posted by 85Dodge600Turbo View Post


I'm willing to leave well enough alone if it will ruin the engine.
Not looking to race, just get more pick-up leaving the light.
Just an FYI....
Increasing your boost level and leaving everything else stock will not increase you standing start or 60' times since you will still have to overcome RPM vs Turbo Speed(Lag Time) before boost kicks in.
A higher boost level will increase your pull and HP once you are moving and RPM's are up.
If you want to increase standing start performance(60'/330' time) you need to be able to flow more air in and out and increase engine RPM's at a greater rate.

You want quicker acceleration get an 89/90 VNT(2.3 seconds from a standing start to full boost..12 lbs)
89 T-2 took 4.6 seconds to accomplish the same(as per Chrysler Corp)
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Old 12-31-2013, 12:10 PM   #14
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I would put an intercooler on it before going past stock boost
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Old 01-05-2014, 12:42 PM   #15
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Just finished installing the control valve and dialed it in. It seems that in stock configuration, pushing past 12lbs made no perceptible gain in performance. Pushing past 12lbs under load does nothing but move the needle move closer to the cutoff point. I dialed back to 11lbs where it seems to behave the best.
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