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Matt
Matt, Engineer
Category: Dodge
Satisfied Customers: 20591
Experience:  Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
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Need help with dodge stratus idles rough and shakes when in

Customer Question

need help with dodge stratus idles rough and shakes when in drive
Submitted: 9 months ago.
Category: Dodge
Expert:  Matt replied 9 months ago.

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 flattenedpiece 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

Air leaks are very temperature dependent as gaps can open or close up as things expand with heat, so the weather and engine temperature can effect them.

This leads them to be quite intermittent in the case of mild leaks

its also worth cleaning the airflow meter by removing it from the car and spraying the exposed sensor wires inside the tube with a brake or switch cleaner - ensure that the cleaner is one of the old fashioned, non Eco type that does not leave a residue

On no account touch the sensor wires with anything physical as they are extremely fragile

Customer: replied 9 months ago.
i have checked for air leaks/ cleaned air flow sensor..... sounds like its running on 2 cylinders.....? compression tested
#1 185 #2 185 #3 187 #4 187 it the 2.4l sohc
Expert:  Matt replied 9 months ago.

Hello

Ok as the compression figures are all equal then the cam timing is correct

so I'd next check that you have spark on all cylinders and if thats OK then check over the injector wiring for issues ,

I'd check the condition of the injector plugs / connections as this could be a lean misfire if an injector isn't firing properly - the best way to check this is with a 'noid' light

http://www.noidlight.com/

Then check all the connections to the engine sensors one at a time, remove each one and examine for signs of corrosion or damage and a squirt of contact cleaner ( not WD40) will also help.

Customer: replied 9 months ago.
What is the best way to test for spark on coil pack ignition system
Expert:  Matt replied 9 months ago.

Hello

you can remove the coil pack and fit a plug into the end and just rest it on the metal of the engine so the plug thread is earthed

there should be sufficient grip on the coil pack boot to hold the plug against the contact spring

sometimes you need to use some ty-wraps to secure things