Just A Guy
Join Date: Mar 2007
Location: New Jersey
My Ride: 1990 Daytona Shelby
Engine: 2.2 L VNT
Thanked 1 Time in 1 Post
Re: Engine Noise
My Son has a 2003 Grand Caravan so we have Alldata for that vehicle.
Starting with your noise...
First you need to eliminate any belt driven accessory as being the culprit.
(Idler Pulley, A/C Compressor, Alternator, Water Pump, Power Steering Pump)
1)Remove the belt(s), start the engine...
2)Is the noise still present?
Secondly, your driveabilty issue...
Pressing on the "gas pedal" does not do anything on a fuel injected car.
Opening the throttle while cranking only allows more air in, it has nothing to do with fuel.
T exception to this is "Clear Flood Mode".
If the engine is flooded then pushing the pedal to the floor while cranking tells the engine controller the engine is flooded and it shuts off the injectors until you release the pedal.
1)Are there any fault codes stored?
(You can try the key on/off on/off, on code retrieval method or go to AZ and they will scan for codes for free)
2)Check and Verify Fuel Pressure.
(Fuel Pressure needs to be 58 PSI +/- 5 PSI.
I was a Jeep Tech for 15 years and hard start in the morning/low pressure was a common problem and related to seals in the fuel pump module, your car uses the same style pump.
You are going to have to rent a fuel pressure gauge from AZ.
Testing is straight forward, I would suggest doing this in the morning after the van has sat overnight.
a)You have a service port on the front fuel rail, connect the gauge.while cranking the engine watch fuel pressure.
b)How long did it take for fuel pressure to build to specs?
c)With the engine running read fuel pressure.
d)Is fuel pressure withing specs?
e)Tape the gauge to the windshield, (You will need a helper for this) drive the car until the hesitation you described is present.
f)Did fuel pressure stay in specs when the driveabilty issue was present?
Post back with your results or if you have any questions/concerns.
1990 Daytona Shelby VNT
40 Years ASE Certified (Retired)