hi i have a 1991-1992 (we think the car was rebuilt with 92 parts because the VIN says its a 91) dodge dynasty 6 cylinder 3.3 liter engine

the problem: after the car starts,.. it will die, i crank it up it starts, revvs up then dies stays alive for maximum of 3 seconds, if i hit the accelerator the car will revv up and stay alive for about 4-5 seckonds then die

all the parts i have replaced and hopefully in the order i replaced them in

the fuel pump has been replaced about a year and a half ago (autozone)
the computer has been replaced less then a year ago (dealer part)
CV axle's front driver and passenger (O'rilleys)
cattilic converter (mecannic part)
O2 sensor (Orilleys)
Problem with car starts
i have tryed changing the fuel filte, to no avail (O'rilleys)
i inter changed a distributor cap with a 96 dodge intrepid to see if that was the problem (same part)

i ran some diagnostic on my car with my uncle and dad (both are or have been mecannics)

fuel pressure 40psi when i hit the accelator 50psi
we noticed the spark plugs were not produging a lot of spark,

what happned: i was driving down the road and i saw cheap gas i was kinda low so i decided to go for it filled it up with 10$ worth of fuel, went to start the car and that is when the problem first arose

my current mission is to get some engin starter and spray it into the intake maniflod to see if the engin stays on


(This post was edited by JohnsShadow on Oct 16, 2009, 3:02 PM)

Your going to have to monitor fuel pressure, spark and injector pulse as the engine dies to determine which one is dropping out first. That's the only way to isolate the cause.




78 Corvette Pace Car For Sale-18k mi orig-Florida

In Reply To

wel i have spent a great deal of time monitoring the fuel pressure
after the car dies the pressure stays consistant it dosent drop or nothing

iver tryed cranking it, RE- cranking it, repeaditly cranking it, cranking it with the accelerator, crakning it from the on possition and its always stays at 40 psi but jumps to 50psi durring the first seckond of ingition then drops back, the same happens when i hit the accelerator

how would i mesure the spark or the fuel injection flow?

OK, you've got the fuel pressure covered. Now you need to monitor the spark and injector pulse.
Use a spark tester at the end of the plug wire and a noid light bulb plugged into one of the injector plugs. When it stops flashing, you lost injector pulse. If your losing injector signal, then you also want to monitor the power wire to the injectors to see if that is dropping out.

Spark tester





noid light







78 Corvette Pace Car For Sale-18k mi orig-Florida