engine codes!

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01-02-2019, 04:59 PM

Harry Peter Rose

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engine codes!

HELP! ....losing hair / losing sleep /.......need to resolve issue SAP!

Continuing problem from engine warning light coming on and retrieved codes /well established service shop with good reputation with X Series etc. {but I am getting nervous!)
2002 2.5 AUTO /AWD /Petrol 65,000 miles
3/8/2018/ CODES P0171 & P0174....Cruise control unavailable message...
Replaced upper intake manifold upper air control valve seal.......codes cleared

RAN WELL UNTIL 12/6/2018/ ENGINE WARNING LIGHT /CODE P0I71
Smoke test for leaks ....Replaced intake manifold tuning actuator seals and booster hose assembly

12/19/18 ...ENGINE WARNING LIGHT /CODE P0I71 & P0174
Suspected cause...lean condition one or more fuel injectors on each bank
Performed Engine Decarbonizing and Fuel Injection Cleaning SERVICE
Motorvac throttle body plenum and intake cleaning / Motorvac internal combustion chamber cleaning
Codes removed and drove well for next couple of days ....Engine Warning light back on with occasional Amber Light for a few minutes

Anyone have had similar problem and can suggest anything? / very appreciated.....Do I change mechanic? or just what the hell are they missing?........

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01-03-2019, 03:26 PM

JagV8

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Change shops or DIY.

For DIY get a cheap OBD tool and use live data to see fuel trims - read forum messages about how & those codes.

Stop swapping parts at silly cost and find out what is actually wrong.

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01-03-2019, 06:32 PM

Harry Peter Rose

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Quote:

Originally Posted by JagV8

THANKS JAGV8...…....appreciated
OBD TOOL PROVIDED CODES P0171 & P0174.... Mechanic hopefully has been looking "live data to see fuel trims"
what should he be doing~
update last two days engine has stayed off!>>>>>>>>>>>?

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01-03-2019, 07:39 PM

Dell Gailey

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P0171 & P0174 are nearly always a vacuum leak. Just do a search here and read the conditions and results. There are too many threads to repost.

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01-04-2019, 09:30 AM

astromorg

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+1 above

A common cause of those codes has been the 1 in dia crankcase breather hose from the cambox nearest the radiator to the inlet manifold. It wears and splits on its underside out of sight

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01-04-2019, 11:55 AM

Alfadude

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Also check the brake booster check valve and check the accordian hose between the MAF sensor and the throttle body to make sure it isn't split or loose.

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