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Discussion Starter · #1 ·
I have been getting code 13 on my new 90 Lebaron VNT, so I started tinkering under the hood to check for loose/rotted vacuum lines. Aside from finding a horizontally installed PCV and a whole lot of oil in the intake, all the vacuum lines looked OK. The PCV was an interesting find considering the previous owner had the dealership do all maintenance. Anyway, when I disconnected the vacuum line that goes from the MAP sensor to the MAP solenoid, a drop or two of fuel came out of the line. I drove it home from the parts store and pulled the same line off again and another drop or two came out. Any ideas?

Also - the car averages about 21mpg, throws no other codes (other than 12), and develops boost not like I would have expected from a VNT. It makes pretty good torque down low, better than my 86 daytona T1, but I don't feel any boost 'till 3000rpm or so. Then it's a rocket, the boost gauge reads about 12-13psi at that point.

Thanks.
-Steve
90 LeBaron GTC Coupe VNT 568
86 Daytona Z T1
92 Stealth R/T TT (not a mopar, but I love it anyway)
 

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A bad fuel pressure regulator could introduce fuel into the vacuum system but it is kinda interesting that it would be at the map unless when you go into boost it was blown to the map from the fpr. Just my idea just throwing it out there.
 

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A bad fuel pressure regulator could introduce fuel into the vacuum system but it is kinda interesting that it would be at the map unless when you go into boost it was blown to the map from the fpr. Just my idea just throwing it out there.

Id have to say it would probably be a bad fpr also. You might want to check your fuel pressure.
 

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FPR also.
On my VNT the FPR and MAP lines are Tee'd so fuel in that line would not be uncommon with a FPR problem.
 

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yep, just had an FPR hooked up to my system doing some testing and soon as I turned on the fuel it sprayed out the vac line.
 

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You should be getting full boost before 3000 rpms. On my shadow vnt its at 12psi by at least 2000 rpm. I would check to see of the vanes are free on the turbo and the acuator is working.
 

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Discussion Starter · #7 ·
when I reach my hand up in there from underneath the car I can get the actuator rod to move a bit, it feels like I am resisted by it's spring. Plus, the previous owner kept all maintenance records and it had a turbo rebuild a few thousand miles ago so I think that the vanes are fine. Could the diaphragm be torn, allowing vacuum/boost to flow from one side to the other?

I'll connect a pressure gauge to the fuel rail tomorrow. The car just gave another code - 52: O2 too rich - so I guess that goes with the possibility that the fpr is toast.

I also forgot to mention that I have to open the throttle most the time when I cold start it.
 

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The code 52 goes hand in hand with your code 13 Map Pneumatic code.
 

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Discussion Starter · #9 ·
You should be getting full boost before 3000 rpms. On my shadow vnt its at 12psi by at least 2000 rpm. I would check to see of the vanes are free on the turbo and the acuator is working.
Yeah, I drove it on the highway and played around in 5th today to give myself a little more time to observe the boost behavior, and it does make nearly 12 at 2000rpm. In short bursts at 3000rpm - passing - it peaked at 14-15 (assuming the gauge is correct). The gauge is so much more responsive than my 86 daytona's! Anyway, it just seems that there is still horrible lag when launching between lights, but the turbo kicks in sooner. Maybe I need a BOV, or just that the fuel in the vacuum lines is effecting the timely actuation of the vanes.

on what 2.2 turbos is the fpr interchangeable?
 
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