Q: On 2nd remanufactured Mass Air Flow sensor, & it still runs better with it disconnected. Any ideas? 1001 Dodge Colt

asked by on December 12, 2016

about 4500 miles ago, I changed oil adjusted valves, changed spark plugs & wires. All part of routine maintenance . 500 miles later I lost my cold start, & had to give it gas to start. Slight pressure on accelerator. Then about 1000 miles later the car began to spit & spudder under acceleration, & while trying to maintain 55mph. I also noticed that it would pop & rumble during deceleration. I disconnected the MAF and the spitting & spuddering went away except for under hard acceleration, & still no cold start. The deceleration issues disappeared as well. I've tried 2 different MAF sensors, both remanufactured & from the same place, and my cold start works again & no issues with deceleration. But it spits & spudders under mild-heavy acceleration or even trying to climb hills, or maintain 55 mph. It is just like its running out of gas or has water in gas. Neither one of these is the case. I disconnect MAF, I'm back to the no cold start, low idle speed, and stumbling under heavy accel.

My car has 252000 miles.
My car has an automatic transmission.

Hi - I would first check for problem codes (even though you are pre-OBD II), diagnostic codes can be very useful in cases like this. It sounds like you have a fuel supply issue - low fuel pressure, leaking/clogged injectors, clogged fuel filter, weak fuel pump, etc. I would check fuel pressure while running if possible, especially running up hills - high load. For diagnostic assistance, I would recommend a fuel system inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?

Hi there. From what you are explaining it sounds like you have an issue with the valve adjustment. If the valves were not adjusted properly then the valves will not open and close properly. This will also affect the operation of the air flow sensor as the valves will affect the air flow. It can also be a circuit issue but most of the time it is the valve adjustment. I would check the valve adjustment again and do a compression test to see what is going on within the engine. If you need to have this running condition checked, consider YourMechanic, as a certified mechanic can come to you to [diagnose why the engine is misfiring] https://www.yourmechanic.com/services/engine-is-misfiring-inspection

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

I moved my truck and it started fine. Went to get back in it and it wouldn't start just a faint single click.

You may have a problem in your wires somewhere. If you have a wire short it could possibly cause this. However, you may have a faulty part. Look for wires around your starter that may be touching the frame. Is...

Showing signs of a blown head gasket.

If there is a head gasket leak, as the engine heats up and expands, that may be sealing the leak somewhat and that would explain your experience. Based on what you are describing, it certainly sounds like a break at...

strange maybe pressure release sound from right rear sounds like on inside

Hey there, the sound you may be hearing is coming from the A/C system expansion valve when refrigerant going through it. You may have an A/C system that is a little low on refrigerant, and needs to be checked for...

Related articles

A Buyer’s Guide to the 2012 Dodge Avenger
The The newly redesigned 2012 Dodge Avenger is a really impressive addition to the mid-size sedan market. This model is Dodge’s answer to the likes of the Honda Accord and the Toyota Camry, and while it may not have quite...
A Buyer’s Guide to the 2012 Dodge Charger
If If you’ve always loved driving performance cars but you don't know how you’ll fit a baby seat in a Mustang or a Camaro, the 2012 Dodge Charger could be the car for you. While it has the room and...
How Long Does a Fuel Injector Last?
The fuel that resides in your gas tank has to be carried to various spots of the engine to be burned and used...