Hesitation acceleration 1997 grand caravan hesitates when accelerating. changed crank shaft sensor . no check engine light on

Engine Runs Rough, Stalls, Hesitates on Acceleration, Hard ...

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Ford Probe Engine Runs Rough, Stalls, Hesitates on Acceleration, Hard Starting, Poor Performance. This is a verified problem based on 9 reports. Learn more ...

Starting Problems - 1997 Ford Probe - RepairPal

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Dec 5, 2010 - Starting Problems on 1997 Ford Probe ... If the engine runs rough,stalls, hesitates on acceleration, is hard to start, or has generally poor ...

A new misfire/hesitation on accel. Problem.. - ProbeTalk.com Forums

forums.probetalk.com > Tech Section > 2nd Gen (93-97) V6 2.5L

Check the fuel pressure. If you have 30K miles on your jeep and the spark plugs in this motor need to be replaced. Jeep Grand Cherokees are notorious for not doing well with fuel with lower octane. Fill your Jeep with at least medium grade gasoline, especially if it has been shuddering or hesitating while you're attempting to accelerate.

ENGINE HESITATES WHILE ACCELERATION

LOSS OF ACCELERATION

It can be fuel pressure issue or it's the problem with accelerator pedal or its clogged filters causing there.

There are many other possibilities. I suggest you to go through the list of help links mentioned below, these will help you to confirm where the actual fault lies: -------

Jerks and Hesitates During Acceleration?

http://technoanswers.blogspot.in/2012/07/2004-dodge-town-country-jerks-and.html

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Loss of acceleration?

http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html

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Headlights flickering and car hesitates to start?

http://howtobyme.blogspot.in/2012/02/headlights-flickering-and-car-hesitates.html

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How exactly the Vehicles Accelerator Cable works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

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How exactly Vehicles Accelerator Pump Diaphragm Works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html

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2000 Toyota Avalon: Engine Lean Codes and Knock Sound on Acceleration?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-engine-lean-codes.html

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2004 Toyota Avensis: Acceleration And Deceleration makes noise on Front End?

http://whatisbyme.blogspot.in/2012/05/2004-toyota-avensis-acceleration-and.html

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Wheel hop under hard acceleration?

http://technoanswers.blogspot.in/2012/04/wheel-hop-under-hard-acceleration.html

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2009 Chevy impala accelerator pedal sensor?

http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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Nissan Pathfinder stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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Acceleration lag problem?

http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html

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These details will help.

Thanks.

A long list of things.
Is the check engine light on when you are driving ?
Have you checked the fuel pressure after replacing the pump ?
Have you checked the throttle position sensor ?

try a new one or try fuel filter

A slight hesitation after engine shut off due to engine running rich meaning not meeting golden air:gas ratio of 14.6:1 so fuel residue in chamber continue to burn for the last moment. The same rich fuel problem that was why you had to let gas off during acceleration. Need to Check out the O2 sensor Check out MAP sensor Good luck

the funny thing is , we have had this problem also , the check engine lite came on , said downstream 02 sensor bad. replaced it. still had hesitation. change plugs and wires. still had hesitation, replaced fuel pump/fuel filter/fuel screen assembly, and the S.O.B. still has this problem. im running out of ideas except that i have run into other posts that say the crank position sensor , or the computer itself could be the culprit... all my switches and and other components seem to be working fine, though it makes me wonder also if tha cam sensor could also be going bad....

A pop and hesitation is likely a backfire. The hesitation around 40 and 50 would be in keeping with that theory. There are several reasons you might be getting backfires and hesitation. If your ECM is adjusting the engine to run too rich this could happen. Misfiring might be occuring. Timing could be out. But one of the most likely is a restricted exhaust, likely due to a plugged, damaged or worn out catalytic converter. In some cases the converter may be bad enough to be giving you some performance problems, but not yet quite bad enough to signal an error. A vacuum test can help confirm whether this is exhaust related.

You should definitely replace the fuel filter though this probably won't fix your hesitation. It wouldn't hurt to replace the spark plugs this is usually the culprit on these engine. I have the same engine in a '99 caravan and found the for some reason the spark plugs on cylinder 3 and 4 loosen up after one year and cause a misfire between 45 and 50 mph under load (when mildly accelerating).

The knock is caused by either timing issue or a lean cylinder condition, have you checked the fuel pressure?? has the fuel filter been changed?? A bad knock sensor will not set a light unless it is open or disconnected.