Question about Acura Cars & Trucks
New plug,new coil,removed intake plenum,cleaned egr, tested injector pulse,new plug removed for inspection, extreme lean condition,no vacuum leaks,compression 220. all gaskets removed in good condition,lower intake has metal gasket.any clues ????????????????????
Check out the fuel pressure and fuel flow. There is a filter basket in the injector ,just in side the where the fuel line connects ,it can be removed with a small self taping screw , take care not to damage it. also check the injector spray and volume of fuel injected over a given time.
Posted on Nov 30, 2014
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Posted on Jan 02, 2017
My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.
Posted on Dec 10, 2008
In the past i have had these act like this when the cam sensor pick up magnet falls out of the cam sprocket. You can pull the cam sensor and bump the engine over untill you can see if the magnet is still in place. This will require a mirror and a flashlight to see inside the timing cover through the cam sensor hole.
Posted on Nov 22, 2009
SOURCE: My check engine is on test
Hello: There was a GM bulletin that pertained to this problem, It involved the head and valve train. You should go to a Chev dealer and see if the VIN of your truck falls in the group of units involved. The fix was to replace the head. If your truck is out of warranty I don't know if GM would cover the repair expense.
Posted on Jan 25, 2011
Testimonial: "very helpful"
SOURCE: vehicle came in for check
A misfire at idle that smooths out at cruise is ALMOST ALWAYS caused by a vacuum leak. Take a hard look at your fuel trims at idle. If the Bank 2 Long Term Fuel Trim is more than + a couple points higher than the Bank 1 trim, your problem is most likely a vacuum leak. If the Fuel Trims even-out while holding the engine at 2000 RPM for about 20 seconds, then a vacuum leak is DEFINITELY your problem. I would suspect a leaking lower intake gasket leak because an upper plenum leak will normally affect all cylinders.
Posted on Jan 30, 2011
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Aug 17, 2016 | Cars & Trucks
MAF: A Mass Air Flow (MAF) sensor output that causes the PCM to sense a lower than normal air flow will cause a lean condition.
Air Induction System: Air leaks into the induction system which bypass the MAF sensor will cause a lean condition. Check for disconnected or damaged vacuum hoses, incorrectly installed or faulty crankcase ventilation valve, or for vacuum leaks at the throttle body, EGR valve, and intake manifold mounting surfaces.
Fuel Pressure: Perform a fuel system pressure test. A faulty fuel pump, plugged filter, or faulty fuel system pressure regulator will contribute to a lean condition.
Injector(s): Perform injector coil/balance test to locate faulty injector(s) contributing to a lean or flooding condition. In addition to the above test, check the condition of the injector O rings.
EGR: Check for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
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