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My 1999 Pathfinders check engine light has come on. It is exhibiting missing and rough running at stop signs after it has warmed up.

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Posted on May 15, 2017

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Having trouble with engine killing or running rough even after it's warm.


not for sure but it could be your cam sensor. if the check engine light is on then take it to a parts store and they can run a scan and give you more information

May 11, 2014 | 1993 Buick Riviera

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1993 gmc sierra 4wd runs rough after engine warms up.At stop lights she will stall out if i dont keep foot on break and give a little gas. any suggestions ?


Question, does this pickup blow black smoke on idle or at a stop sign. If so check your map sensor might be plugged up or unplugged or bad.

Mar 05, 2014 | 1993 GMC Sierra K1500

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Was running fine engine warm stopped check engine light came on idle got very rough sounded like a miss?


You will need to have it plugged into a scanner or at least a code reader to find out what code or codes it has and then go form there.

May 02, 2011 | GMC Safari Cars & Trucks

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Missing at cold start both codes po171 and po174 runs ok on the road and after warmup stops missing


year make and model would help a lot.

P0171 and P0174 are lean codes. Since it is running rough at start up and goes away when warm it is usually a sign that the plenum gaskets are leaking. If this is a pickup with a 5.3 liter than for sure the intake plenum gaskets that go in between the intake and the heads are leaking. Very common problem. Once the engine warms up everything expands and the leak seals itself up.

If you can post the year make model and engine size I can help you out a little more.

Nov 28, 2010 | Chevrolet Tahoe Cars & Trucks

1 Answer

Have 2005 lincoln aviator - has miss at 30-55 MPH - no codes replaced all coils ( ford) & spark plugs (twice) - repair vacuum leak at PCV Still misses -- no codes -- help


The COPS (coils) may have shorted the drivers in the PCM (computer). You should get a misfire code for each cylinder misfiring though.

Slim possibility, but very expensive unless you have a service contract.
LINCOLN: 1999-2004 Navigator
2002-2003 Blackwood
2003-2005 Aviator MERCURY: 2003-2004 Marauder
ISSUE: Some 1999-2004 Navigator, 2002-2003 Blackwood, 2003-2005 Aviator, 2003-2004 Marauder and 2003-2004 Mustang vehicles built before 12/19/2004 equipped with 4.6L 4V/5.4 4V engine may exhibit a runs rough, lacks power, and engine misfire, prompted by a MIL light and DTC codes P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, and P0316.
ACTION: Diagnose engine for engine misfire concern. If diagnostics determine an engine misfire which is characterized by leakage through exhaust valve(s), only replace the affected cylinder head(s).
SERVICE PROCEDURE FOR VEHICLES WITH RUNS ROUGH/MISFIRE CONDITION:
  1. Perform relative compression check on all cylinders. If abnormal, check cylinder leakage and actual compression for "low" cylinders refer to Workshop Manual (WSM), Section 303-00.
  2. If leakage/compression check indicates a valve train concern, per valve train diagnostics in WSM, Section 303-00, replace cylinder head and cam assembly, pipe plugs and timing chain tensioner, per procedure outlined in WSM, Section 303-01.
  3. If cylinder leakage and compression tests are inconclusive, perform misfire diagnostic, per TSB 05-22-8. NOTE: DO NOT TRANSFER SPARK PLUGS. INSTALL NEW SPARK PLUGS IN REPLACEMENT CYLINDER HEAD AND CAM ASSEMBLY. NOTE: THE ENGINE MISFIRE CONCERN IS TYPICALLY EXHIBITED ON THE LEFT HAND CYLINDER HEAD AND RARELY ON THE RIGHT HAND CYLINDER HEAD. UNLESS CONFIRMED, THE RIGHT HAND CYLINDER HEAD SHOULD NOT BE REPLACED AS AN "EXTRA MEASURE" SERVICE PRECAUTION. NOTE: THE REPLACEMENT CYLINDER HEAD WILL NOT IMPROVE OR REDUCE ENGINE HORSEPOWER OR TORQUE ABOVE ADVERTISED LEVELS.

Sep 24, 2010 | 2003 Lincoln Aviator

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If come to A light or A stop my engine want to stop I have to push on the gass if I don`t it will stop it`s ok is long I don`t STOP.1999 fordr explore 4 door xlt (ingine light is on)


does it start and run at idle in park.
it is probably either a vacuum leak or an idle air control valve,
if it misses and runs rough before it dies maybe a vacuum leak.
if it just idles too low, the iac valve

May 19, 2010 | 1999 Ford Explorer

1 Answer

Idles rough after engine is warm


check ALL vacuum lines for cracks/holes and replace as nesissary

Feb 25, 2010 | 2003 Mazda Mazda6

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