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camerontech
camerontech, auto technician
Category: Acura
Satisfied Customers: 380
Experience:  diagnostic auto tech
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I have MDX acura 2002. new timmingbel, new coil, new

Customer Question

I have MDX acura 2002. new timmingbel, new coil, new sparkplus. check engine light still on and misfire all cylinder. please help.
Submitted: 1 year ago.
Category: Acura
Expert:  camerontech replied 1 year ago.

Hi there,

My name is ***** ***** I am a licenced diagnostic technician with over 20 years experience.

I will do my best to help you with your automotive problem. Please remember, I cannot see, hear or feel your vehicle which can make diagnosing very complicated and some vehicle require extensive diagnotics that require certain diagnostics computers that can not be done over a computer or phone.Please be patient as I am not online 24 hours a day, as I do work, but I do check my page every day.A positive rating is always appreciated for my time and knowledge to help you with your problem.

If you have access to a scanner, fuel trim numbers and maf reading will need to be checked. a compression test might be necassary.

1. Verify that the EGR valve is not stuck open. I have had multiple mdx's with the egr valve stuck open

2. Check engine vacuum. If the engine vacuum is low, then check the timing belt alignment and the valve adjustment. If the valves are tight, it will cause low engine vacuum and high Manifold Absolute Pressure (MAP) voltage, stalling and misfires.

3. If engine vacuum seems normal, ccheck fuel pressure and injector pulse and scope pattern.

4. If the misfire only happens on acceleration, ,verify the EGR passages are not restricted causing uneven distribution of the EGR gases. To clean the passages, remove the top cover of the intake manifold.

5. If the misfire only occurs while driving, one faulty ignition coil causing a misfire can set all the misfire codes on this vehicle.

6. check for vacuum leaks around the intake manifold as a lean mixture will cause multiple misfires, this will be seen in the fuel trim numbers too.

I find these engines just need one cylinder to act up and it will cause multiple misfire codes.

These are bad for valves too, a compression check will find this too.

but I would start with the egr valve first as i have done a bunch of these for sticking open

I hope this helps you and if you need any more info than please let me know!

I appreciate positive ratings!

cam

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