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Dan
Dan, ASE Certified Technician
Category: Jeep
Satisfied Customers: 1368
Experience:  Dealer Auto Technician
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My 3.8l misfires when I put it into drive. In park it does

Customer Question

Hi My 3.8l misfires when I put it into drive. In park it does not misfire. What could be the cause
JA: How many miles are on the car? Is it a steady misfire? Or random?
Customer: Random misfire I have approx 7500 miles on the clock
JA: What is the model/year of your Jeep?
Customer: 2010 Jeep wrangler unlimited
JA: Are you fixing your Wrangler Unlimited yourself? What have you tried so far?
Customer: I have not tried anything yet
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 23 days ago.
Category: Jeep
Expert:  Dan replied 23 days ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you with your question.

Customer: replied 23 days ago.
Hi
just to note that the power steering is also hard when i have come to a stationary positin
Expert:  Dan replied 23 days ago.

You need a scan tool to check for codes to see if you have any misfire codes. This will narrow down which cylinder is misfiring. The most common cause for this is a faulty coil. Could also be spark plugs and or wires.

Customer: replied 23 days ago.
My issue is that when I put the vehicle in park it goes away
Expert:  Dan replied 23 days ago.

The most common cause for power steering being hard is the fluid reservoir being blocked and clogged. It could also be a faulty pump. There could be air in the system caused by a faulty hose or any hoses that have any seepage or leaks.

Expert:  Dan replied 23 days ago.

When you put the vehicle in park there is no load on the engine and therefore the misfires will be less noticeable.

Customer: replied 23 days ago.
I live in the UAE
Customer: replied 23 days ago.
I have a superchips programmer so i will check for an error code
Expert:  Dan replied 23 days ago.

Ok

Customer: replied 23 days ago.
I am leaning more toward the power steering issue that may be causing this
Expert:  Dan replied 23 days ago.

Remove the drive belt and idle the engine, this will isolate the problem.

Customer: replied 23 days ago.
Ok will do Thanks
Expert:  Dan replied 23 days ago.

Please reply to this if you need more help and we can continue this conversation at no extra charge. This does not have to be my only answer. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. Hoping to be giving you 5 star service.

Thanks