87 dodge daytona PLEASE HELP

[Lee'sdaytona]

I own an 87 daytona pacifica (turbo 1 manual trans.) (I posted this in the engine electronics too) I am not sure if this is electrical or EFI related or both. When I hit a bump on Either side of the front two tires the tach gauge goes to 0 and back up. THe car bucks when this happins. Some really bad bumps it completely dies (i.e. the tach stays at 0) When I pull over and try to start it,
it will not start...just a puff of white smoke comes out the tailpipe and i have to wait a minute or so for it to turn over again. Almost every time I start my car it revs up to 2500 or 3000 rpms and goes back down to about 1000 or 1500 rpms...
Does my EFI have Issues or is it a loose wire???
Any help would be appreciated
Thankyou
Lee

where do you live??? sounds like something is loose, electrical maybee??? look around under the car for anything out of the ordinary.

[Lee'sdaytona]

I live in Ewing New Jersey...You? A few guys from electrical said it can be caused from the HEP and its wires (something to do with the distributer) Today when I was driving...or tring to drive, I did not have to even hit a bump...it was really bad...the tach would drop to 0 and then rev really high to 3500 rpm and down to 0 and the whole process would repeat. It did this at a standstill...could a loose wire do that???

[artur_p]

check all the grounds under the hood aspecialy the one that grounds the injector harness. better yet clean them all up.

[Lee'sdaytona]

where is the injector harness ground located?

[glhsken]

Don't forget the ground EVERYONE forgets... Passenger mount to the frame rail.

[artur_p]

Quote:

Originally posted by Lee'sdaytona where is the injector harness ground located?

its mounted to one of the fuel rail bolts on the intake manifold.

[Lee'sdaytona]

A mechanic that saw this car once told me he replaced all the grounds. But there is a few things I just don't get. When this car sits for months at a time you can drive it after that period of sitting and take it over the worst bumps for two weeks and it will drive like a normal car. WHY??? I have really had it with this car but I really don't want to let it go. I have too much money in it. 2 mechanics couldn't find it. the guy who replaced the grounds also replaced something with the ignition...but it didn't fix it. Thursday it is gonna be towed to a different mechanic. This mechanic said they had some old lady's chrysler that did some really weird things and they replaced the logic module and it seemed to fix it. I have a logic module from an 86 laser with the map sensor. When I went to replace it, my logic module was dated 1999...with no map sensor on it. I thought the map sensor was supposed to be like the one from the laser in the 87 daytona turbo 1's??? If a ground was bad, couldn't that be seen by a good mechanic??? Why is my daytona the only one (so it seems) that acts like this???

[artur_p]

my girlfriends daytona had a very similar problem, we went to 3 different mechanics and none of them could figure it out. i later found that the injector ground wire was loose.

[Lee'sdaytona]

well that makes me feel a little better. I will have the mechanic check that out first
thanks

[Lee'sdaytona]

(update)
I called the garage this morning and they said they are almost positive the logic module was the problem. When they tapped it the car "did it" and when they opened the logic module (which was replaced in 1999) they found mold and water in it. OK so the logic is bad...but what I don't get is WHY does the car "do it" when the hood, and driver door is slamed, however, when the passenger door is slammed (logic right near the pass. door) it doesn't set the car off??? are they going in the right direction with this?? I told them about the injector harness ground and the female pins loosing up but before they got to messing with that they tapped the logic and got the car to perform for them
Any input would once again be much appreciated
thanks
Lee