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Car won't go over 40mph rpm sometimes a 3000 ... car

Car won't go over...

Car won't go over 40mph rpm sometimes a 3000 ... car shifting from time to time and also when shifting gears i get a jerk

Mechanic's Assistant: How old is the transmission? Have you checked the brake switch?

No and I wouldn't know went to aamco they said transmission was great we replaced solenoid pack

Mechanic's Assistant: What is the model/year of your Chrysler?

2007 Chrysler Sebring

Mechanic's Assistant: Are you fixing your Sebring yourself? What have you tried so far?

No I was taking it to aamco my next step is the dealership and also th tried replacing computer it didn't work.. so now I don't know what's next

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

No thats it ma'm

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Answered in 2 minutes by:
3/20/2018
Matt
Matt, Engineer
Category: Transmissions
Satisfied Customers: 22,903
Experience: Mechanical Engineer BEng Hons22 years experience in car engine industry, 10 years in formula 1
Verified

Hello and welcome to Just Answer

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 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 or brake cleaner 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.

Air leaks are very temperature dependent as gaps can open up as things expand with temperature so depending on how the leak occurs ( on a hose joint with a clamp expansion will help seal and on a vacuum hose expansion will make a leak worse) so leaks can be better or 1 vacuum leak path that you won't find with the above test is if the brake servo is leaking
so try clamping off servo hose to see if this has any effect

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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Thanks Matt

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Customer reply replied 1 month ago
Okay and I also have a oil leak could that be the problem

thanks for the extra information

if the oil leak in on the transmission then yes this also needs checking as low oil levels can mean the transmission won't shift properly and may overheat so also check the fluid level in the transmission

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Thanks Matt

Matt
Matt, Engineer
Category: Transmissions
Satisfied Customers: 22,903
Experience: Mechanical Engineer BEng Hons22 years experience in car engine industry, 10 years in formula 1
Verified
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Category: Transmissions
Satisfied Customers: 22,903
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