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I have slight jerk at 45mph up to 55, i have a 1996 dodge

Customer Question
i have slight jerk at...
i have slight jerk at 45mph up to 55
JA: What is the model of your '55 Dodge?
Customer: i have a 1996 dodge b2500
JA: Are you fixing your B2500 yourself? What have you tried so far?
Customer: spark plugs, cap and transmission fluid change
JA: When was the last time your transmission fluid was checked? Changed?
Customer: i changed it 2 weeks ago
JA: Anything else you want the mechanic to know before I connect you?
Customer: thats it
Submitted: 1 year ago.Category: Dodge
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Answered in 5 hours by:
9/11/2016
Dodge Mechanic: Matt, Engineer replied 1 year ago
Matt
Matt, Engineer
Category: Dodge
Satisfied Customers: 22,141
Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
Verified

Hello

This could be an airleak after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for and can lean the engine out and can also allow the engine to rev up when not desired causing rough running.

As its a mechanical fault it tends not to turn on the fault light and you can sometimes hear a 'hissing' noise with the engine running.

Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts.

The best way to locate a leak is to have the engine running and warm and then spray lighter gas /propane around each joint in turn. If the engine rev's up you've found your leak.

Now you might think that spraying lighter gas around a hot engine isn’t wise, however the flash /ignition point of gas is about 400°C so you need a naked flame or spark to set it off and I’ve used this method for many years without incident.

Work your way through each possible joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.

It’s also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all result in insufficient fuel being delivered to the engine

Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick fault find if you unplug the meter and run the engine without it.

if the engine condition is the same then chances are the meter or the connection to it is faulty

It’s also worth cleaning the MAF sensor wires, as they can get coated with dirt over time which then offsets the reading

Use some contact cleaner or brake cleaner to spray onto the wires to remove the dirt – on no account touch the wires with anything as they are very fragile

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Dodge Mechanic: Matt, Engineer replied 1 year ago

Hi

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Matt
Matt, Engineer
Category: Dodge
Satisfied Customers: 22,141
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Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.

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