Question about 1993 Jeep Grand Cherokee
Initially what is needed is to determine the "code of failure", then know that it and afterwards make l intervention...
Extracting Fault Codes
(sample for an 1991 year; the procedure is the same for other years).
On Board Diagnotic Code Database
(select your type ODB by year's car)
Posted on Aug 26, 2008
a p0303 is a cylinder number 3 misfire, which means that the computer is reading that the number three cylinder of the engine isn't contributing as much power as the others. usually is just a tune-up issue, i would suggest checking or replacing tune-up components. that will usually handle it.
Posted on Dec 10, 2009
P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.Replace MAf sensor,if cleaning the MAF does not help.
Posted on Oct 01, 2010
That code means that there is a misfire on cylinder 3. Could be low compression or lack of spark.
Posted on Oct 19, 2010
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Posted on Jan 02, 2017
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Sep 03, 2015 | Ford Cars & Trucks
Feb 24, 2014 | Cars & Trucks
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.
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.
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