CHECK ENGINE LIGHT CAME BACK ON... MECHANIC SAID TO REPLACE UPPER/LOWER MANIFOLD GASKETS?

2002 Mercury Sable

Tiny

pogo824

December, 31, 2011 AT 9:53 PM

Over past 2 months, have replaced fuel filter, all plugs, coil pack. Overall performance is ok; the accel seems fine, but at idle, engine acts like it's missing. Mechanic wants $220 to perform work. He sprayed brake cleaner looking for vacuum leak(s). Is this the next best thing to do? Do you think the check engine light will stay off? Thanks.

FOUND 17085 RELATED QUESTIONS

11 Answers

Tiny

saturntech9

December, 31, 2011 AT 10:02 PM

What are the exact code numbers you have?

Tiny

pogo824

January, 1, 2012 AT 12:06 AM

I (mechanic) did not write them down, so I'll go by Auto Zone.

Tiny

saturntech9

January, 1, 2012 AT 12:10 AM

Alright let me know have a safe and happy new year.

Tiny

pogo824

January, 2, 2012 AT 5:39 PM

Happy New Year!
Here are the codes from Auto zone.
P0171
definition: fuel trim bank one condition
explanation: the power train control module uses the oxygen sensor to calculate the air/fuel ratio of the engine. The computer has recognized a rich or lean condition on one engine bank only.
P0174
definition: fuel trim bank two condition
explanation: the ECM has detected a rich or lean air/fuel ratio condition on engine bank two.

What do you think?
Thanks, paul

Tiny

saturntech9

January, 2, 2012 AT 7:12 PM

Yes a vacuum leak will cause those codes I would just make sure the intake is leaking vacuum before replacing the gaskets. If it is leaking I would straight edge the manifolds to make sure there not warped while replacing the gaskets.

Tiny

pogo824

January, 2, 2012 AT 7:51 PM

Ok, thanks. Another question - given I've already removed the plenum to change the rear plugs, is putting on new gaskets a big job? Also, is there any harm in driving the vehicle, like 2 weeks until we have the $$?

Tiny

saturntech9

January, 3, 2012 AT 7:34 PM

Its not a bad job to do as far as waiting a couple of weeks I dont see the harm in that.

Tiny

pogo824

January, 4, 2012 AT 1:24 PM

We now have moved to an urgent mode. The engine is cutting off when you come to a stop. It will hiccup and then cut off; does re-start, so dropped off vehicle at the mechanic's garage last night. UGH!
Do you have any comments or possible solution(s)?
Thanks, paul

Tiny

saturntech9

January, 4, 2012 AT 6:47 PM

Need more details did we get any new codes?Also why doesnt it start did we loose spark fuel presure injector pluse?Let me know.

Tiny

pogo824

January, 5, 2012 AT 12:32 AM

SOLVED by the mechanic! Under the plenum he found a hole (more like a slot for a quarter) in the emissions/vacuum hose and pipe - replaced it. Think we are now good to go.
Thanks for your assist, Paul

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