89 turbo 2.5L intermittent stalling

my 89 voyager starts up fine then after a about half a minute of running the RPM drops down to near stalling then RPM goes right back up, sometimes it does stall out and restarts okay. This goes on for 30-60 minutes of driving, maybe longer. It seems to be worse during rainy days, but not sure. When I floor the gas peddle under load, it sputters like crazy. My cruise control is not working and not sure if it is connected to this problem. I'm getting only 13 mi/gal too. I did a code error check using 'check engine' light method and got 13, 54, 55. I believe 54 and 55 are both 'completion of fault code display'. 13 is MAP sensor, but if something else is causing the drop in RPM then manifold pressure would drop causing a code 13. A vacuum gauge shows strong and steady vacuum except for 'RPM drops'. I did new gas filter, plugs, wiring, and rotor, with no change to stalling problem. Any help appreciated.

I have reviewed your fault codes in the Chilton's Caravan/Voyager manual, part #8155, page 4-17, for 1987-1990 MFI engines. Here is what the manual states:

13 - MAP Pneumatic Signal/MAP Pneumatic Change - No variation in MAP sensor signal is detected./No difference is recognized between the engine MAP reading and the stored barometric pressure reading.

This fault indicates that there is a problem with the barometric air pressure reading read by the MAP. You may either have a problem with the MAP itself or the pressure measuring device the MAP reads.

54 - Sync Pick-Up Signal - No high data rate signal detected during engine rotation.

I'm not sure what this is, but you may have another faulty sensor in the engine.

55- Completion of fault code display on the Check Enginer Lamp.

I hope this information helps you. You definitely have a problem with the MAP and some other sensor in your engine. Good luck with your trouble-shooting and let us know what you find.

54 - Sync Pick-Up Signal - No high data rate signal detected during engine rotation.

I'm not sure what this is, but you may have another faulty sensor in the engine.

I hope this information helps you. You definitely have a problem with the MAP and some other sensor in your engine. Good luck with your trouble-shooting and let us know what you find.[/QUOTE]

I appreciate your help.
I believe the Sync Pick-up Signal is the Fuel Sync. Pick-up and therefore connected to the distributor and the Hall Effect sensor. I'll check this out next.

1989 Plymouth Voyger has flasher problems with both turn and hazard als I just noticed that my brake lights are also not functioning! I checked the fuses all are good and I checked the signal stats they are also good the only things I havent checked are the grounds..wherever they maybe the conn's and the combination stalk switch...
didn't catch the sub before posting the engine runs fine... one other thing when the turn signals DID work, they really sucked the power or so the volt meter showed as I thought it would jump out of the case!

Code 12-Fault codes have been cleared or battery disconnected in the last 50-100 engine starts. Normal code-ignore it.:)

Code 13-MAP sensor circuit problem(Vacuum) Before trying to fix this one, fix your code 54 first. Don't know why you have 2 of these showing up in memory.

Code 54-Distributor sync pickup. Replace the pickup asm inside the distributor and check the wiring to it.

Code 55-End of codes-Ignore this

Here is a generic view of the inside of your distributor. Check to make sure the "interruptors in RED" are NOT loose and try replacing the Hall Device/Pickup Asm. Check the electrical connections on the MAP and also replace the vacuum hose and clean out the carbon from the ports that the hose hooks to. Clear codes and see if it runs better.

http://img.villagephotos.com/p/2003-12/537508/HallEffectRemovalHilite.jpg

Thanks Stevo2 for your reply I think I had put that one diown quite a while ago it was the fuel pressure diaphram... now it is the darn lights going screwwy.

thanks stevo2 I'll check the Hall effect system today. Is the best way to zero codes the battery disconnect method? Thanks again...

thanks stevo2 I'll check the Hall effect system today. Is the best way to zero codes the battery disconnect method? Thanks again...

Yes, just disconnect the negative battery cable.

1989 Plymouth Voyger has flasher problems with both turn and hazard als I just noticed that my brake lights are also not functioning! I checked the fuses all are good and I checked the signal stats they are also good the only things I havent checked are the grounds..wherever they maybe the conn's and the combination stalk switch...
didn't catch the sub before posting the engine runs fine... one other thing when the turn signals DID work, they really sucked the power or so the volt meter showed as I thought it would jump out of the case!


I would suspect the turn signal switch or it's electrical connector. Remember that the brake light circuit goes through the turn signal switch. Look there first, could be something burned on the switch or connector?