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Ask Chad Farhat Your Own Question
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Chevy
Satisfied Customers: 3475
Experience:  Owner at Carolina Auto Service & Sales , 20 years Experience in Foreign & Domestic vehicles A6 - Electrical / Electronic systems A7 Heating / Air Conditioning systems
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I have a 2003 chevy malibu. My check engine light kept

Customer Question

I have a 2003 chevy malibu. My check engine light kept coming on about the egr and fuel exhaust. A mechanic erased THE CODES and now nothing is coming up but my car isn't acting correctly. It starts easy, idles well until I turn on my ac fan and shift into gear. Then it idles rough to the point it just stalls. It runs well add long add I don't turn the fan on. I've replaced with new ones...egr, idle control, spark plugs and wires, CLEANED the throttle body plate and checked the wires going to the fan. I'm going crazy over this problem. Please, please help me.
Submitted: 10 months ago.
Category: Chevy
Expert:  Chad Farhat replied 10 months ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Expert:  Chad Farhat replied 10 months ago.

1- you need to check for vacuum leaks ( a smoke test is recommended)

2- Egr tube was it removed off the car and cleaned or he just replaced the egr and sprayed the port of it, a lot of times the tube hard to come out , they prefer not to take it off but if clogged it will cause an idle problem

3- fuel pump pressure was it checked ?


Pressurized Pressure Engine On ............................................................ 59 psi Stabilized Pressure Engine Off............................................................ 52 psi Average PSI beteen Injectors Pressure Drop ....................................................... 1.5 psi

4-if the mechanic looks at the fuel trims reading on scanner it will tell him if the car running rich or lean and that reading will guide him to what to check

5- a compression check also needs checked to be sure and compare readings, since it is a problematic issue & you dont want miss any thing

6- Mass air flow sensor is bad about being defective and NOT throwing a code

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Chad Farhat
ASE Certified Technician