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HONDASERVICE7791
HONDASERVICE7791, TECHNICIAN
Category: Acura
Satisfied Customers: 1972
Experience:  OVER 20 YRS EXPERIENCE, OVER 10 YRS ACURA/HONDA EXPERIENCE
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Acura MDX

Customer Question

I have 2003 mdx with poor fuel mileage and sluggish acceleration. Highest speed possible is 130km/h when accelerator is floored. What could be the issue?

I've been told to replace cam angle sensor as well
Submitted: 1 year ago.
Category: Acura
Expert:  HONDASERVICE7791 replied 1 year ago.

hello and welcome to justanswer.com,

 

How many miles on the vehicle?

 

what was the last major service you performed?

 

is the check engine light on?

Customer: replied 1 year ago.
137k miles.

Last service was regular oil change, replacing nozzles and installing racing switch.

Check engine light is not on. Was showing misfire in 2 cylinders, cleared it 5 days ago and it's not come back on.
Expert:  HONDASERVICE7791 replied 1 year ago.
what exactly are you calling the "racing switch and nozzles" ?
Customer: replied 1 year ago.
Technician called it a racing switch/sensor. It's located close to the oil filter. The nozzles are the 6 filters through which fuel is fed into the 6 cylinders.
Expert:  HONDASERVICE7791 replied 1 year ago.

oh ok you are talking about the fuel injectors and the vtec switch i believe

 

were there or are there any codes stored in the pcm?

 

You replaced all the catalytic converters?

Customer: replied 1 year ago.
Those are the names, yes.

There are no codes at the moment.

I replaced the whole catalytic converter unit. The engine check light went off after the replacement. This is the unit under the car, connected to the exhaust.
Expert:  HONDASERVICE7791 replied 1 year ago.
but there are technically three converters, two right at the exhaust and the third is in the pipe
Customer: replied 1 year ago.
The one I changed was around the middle of the pipe.

Could a fault with the other 2 cause the car to be sluggish, have very poor gas mileage and never exceed 130km/h speed, even withe engine check light being off?
Expert:  HONDASERVICE7791 replied 1 year ago.

yes it is very possible. but i would have guessed that the check engine light would be on.

clogged or partially clogged converters can cause all these symptoms.

 

you will need to physically remove them and look at them to see the condition of the internals.

 

please do not rate my service until we are completely done with your concerns. ask as many question as you want before finalizing your experience. thanks

Customer: replied 1 year ago.
Fair enough. Is there anything else that could cause these symptoms? I would like to check all possible issues if possible.

Also would I need to replace the cam angle sensor as the technician says?
Expert:  HONDASERVICE7791 replied 1 year ago.

not if there was ever a code associated with it and especially if after you cleared the codes and none came back

 

also check the spark plugs and if there is any doubt of the cam angle sensor then i would definitely check the timing belt timing and make sure it is good.

HONDASERVICE7791, TECHNICIAN
Category: Acura
Satisfied Customers: 1972
Experience: OVER 20 YRS EXPERIENCE, OVER 10 YRS ACURA/HONDA EXPERIENCE
HONDASERVICE7791 and 2 other Acura Specialists are ready to help you
Customer: replied 1 year ago.
I have checked all the above. They are in good condition.
Expert:  HONDASERVICE7791 replied 1 year ago.
the two converters that are on the motor are ok? have you removed them and tried to accelerate again? no more codes?
Customer: replied 1 year ago.
They are ok. I did. Still no codes. Throttling while stationary the engine is revved up to above 5rpm
Expert:  HONDASERVICE7791 replied 1 year ago.

I'm hoping you mean 5,000 rpms......

 

if there are no codes, the converters are clear, then i would investigate the condition of the fuel and make sure it is not contaminated

Customer: replied 1 year ago.
I mean 5,000rpm. Thanks for the suggestion about the fuel but doubt that's the issue.

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