'91 Dodge Dynasty V-6

[Jay and Pat]

I took the Dynasty to the shop for them to correct a hesitation and surge problem,I won't go into all the fal-der-al that it took 'til they announced that a regulator had been installed with the result that, now, it is really hard to start and the original problem still persists. Of coarse I took it back. This time they installed a fuel pump, you know what their thinking was here. It still winds for a long time 'til starting and sometimes it starts right away. The shop threw up their hands after several more attempts at correcting the latter problem and didn't charge for the pump. Can anyone help with a solution to this problem. Thank you in advance.

Jay Hennigan <img src="http://www.aaca.org/ubbthreads/images/graemlins/tongue.gif" alt="" />

[Guest stude8]

You probably agree the guys were guessing there way through your problem. A 91 Dodge is fuel injected and it takes a pretty good guesser to get lucky.

Why not just do what Chrysler designed in for service people, check the computer for error codes. With engine off turn the ignition key from off to ON (Not start) and back to off 3 times in succession and then leave it in ON position and observe the "Check Engine" light. It will flash on and off and blink out a sequence of code flashes like "on, off, on, off, wait one second then on, off, on, off, on, off" which equals 2 _ 3 or code 23, go to your library and get a Haynes or other service guide book with code lists and you can narrow it down to what it wrong like bad oxygen sensor, MAP flow value out of spec. Without making an observation it almost sounds like you have a fuel delivery fault that might bad a plugged fuel filter or defective in the tank fuel pump. Good luck with the code search. Stude8

[NTX5467]

On the earlier computer controlled vehicles, there were ways to get the Check Engine light to flash the code sequence. Sometimes, the first code flashed was to signify that it would be flashing codes and didn't mean anything.

Back then, each manufacturer had their own codes and they could change with each model year, so having a code list for that particular year of Chrysler product can be necessary, otherwise you'll be chasing a code for something different than what you really need.

As far as the fuel injection system goes, there should be a pressure tap on the injector rail setup to check the pressure during crank and run modes. Flow isn't enough as it takes a minimum pressure to let the injectors do their thing. Don't forget to check the fuel filter for restrictions.

Be sure to check the operation of the fuel pump and engine oil pressure switches. If there is low or no oil pressure (sometimes or a signal of such to the computer) the fuel pump will think the engine is stopped and not turn on.

The variability of the issue can make for a lengthy diagnosis situation, unfortunately, but just because it's a computer controlled fuel injected vehicle does not mean that the basic items should not be looked at before heading into the electronics. Using the stored computer codes can lead you in particular directions and ease things somewhat, but a thorough diagnosis by competent technicians will need to be done sooner or later.

Hope this helps . . .

NTX5467

[Dave@Moon]

Stude8 is right, checking the codes is the first thing you need to do. Fortunately Chyrsler codes are the easiest to get.

Assuming you have no codes, and the fuel pressure is isolated to be the problem, have you tried a new fuel filter--even if new? Are the injectors clean? Could the problem be ignition (especially bad wires-even if new)?

If you wind up pulling the fuel rail on this car, be very ginger with it. The seams at the right angles which pivor during removal are not very sturdy. I had to replace my dad's rail on his '93 Dynasty last year when that area sprung a (BIG< SUDDEN) leak. The damn thing was expensive, too. <img src="http://www.aaca.org/ubbthreads/images/graemlins/mad.gif" alt="" />

[Guest stude8]

My first reply was made in a rush, sorry but I just remembered the "Allpar" site. Click on the link and it will take you to the code answer forum. Find your yaer and model and read what other users have experienced, you might get your problem cured by reading what others have found.

I have nursed 89-90 Dodge Caravans with 2.5L 4 cyl engines through a few performance faults. Usually the performance problems were dirty injector, dirty injector and dirty injector. Believe it or not, a bottle of STP injector cleaner in the fuel tank when it is down to 1/4 full will give improvement in 50 miles of driving. I didn't believe in chemical warfare before but I got that tip from a Chrysler service manager who said I could spend $110 for a new injector or try the bottle first, I saved about$106 several times now. Stude8

http://www.allpar.com/fix/codes.html