Question about 1999 Dodge Durango

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99 5.2 durango :pulled codes for multipe missfire cylinder #5-7

Started missing out after one tank of ify gas in arizona progressivly got worse. used scan tool to pull codes the codes were for multiple misfire on 5 and 7 cylinders. i changed plug,wires,cap,rotor. no change. neither the wires plugs cap or rotor had any signs of carbon tracks, cracks or fouling. researched further and assumed it might be an induction misfire.found the proper routing for wires in tps service bulliten. no change talked to mechanic who specialized in cylinder heads,he said the exhaust valve seats were going. recomended replacing heads.i checked compression all cylinder readings were between154 lb. to 165lb. so discounted new heads. the funny thing is when it is running (barely) i can pull both the 5 and 7 plug wires there is no change in engine but i can hear the what sounds like spark jumping from the spark plug top to the spark plug heat sheild while i am holding the wires away from the engine!!! i am stumped

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Aloha We have just replaced all of what you have replaced, plus water pump, fuel pump, pcv valve and 02 sensor. Took it to mechanic today we had misfire on 1,2,6,7. Mechanic said that the 99 dodge is known for bad computers, he checked ours and works great turns out that it was the coil. Ours was jumping 1/4 inch and had a orange/yellow spark. it is supposed to have a 1 inch spark and be blue. This has solved our problems after 527 dollars later.
Check the coil!

Posted on Feb 26, 2009

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The fuel injectors might be plugged with **** from the bad gas, try using 1 1/2 bottles of fuel injector cleaner next time you fill up. PLEASE RATE MY ANSWER.

Posted on Feb 26, 2009

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My 99 durango will start up but u have to give it gas to stay running same when pulling down in gear


Change the gas filter. If car sat for 2 years without being started, the gas could be stale Put fuel system cleaner in gas tank. The car may need a double dose.

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Engine misfire on multiple cylinders


Do you have any codes besides P030x? Are you using the stock 1999 5.2 PCM? Do your short-term and long-term fuel trims show anything more than + or - 10? Are your O2 sensors showing normal voltages? You give a long (and impressive) list of modifications, but have you had diagnostics run through the PCM. It is what's controlling timing and fuel delivery. If the problem isn't mechanical it's got to be in the control. If you don't have the gear, invest in the services of an experienced ASE certified mechanic.

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i would not spend the money on heads w/out diagnosing # 5 misfire. misfire is caused by many different things. i would first start by verifying in fact #5 is at fault. start engine, with it running and using well insulated plyers, pull each wire off dist. cap one at a time. you will notice the engine missing worse each one you pull until you reach the one causing the miss. this wire, when pulled, will not change the evident missing cylinder. if it is #5, check spark, at spark plug end. stick a small screwdriver or equivilent in the removed boot, and place it a cm away from a ground source. start engine. observe spark. should be nice and blue, and ark a good inch from ground. if no spark, swap a wire and check again. if still no spark replace cap and rotor. if their is spark, make check plug. even though new, its easy to crack porcilan installing it. try another plug. if still a miss, start engine with plug removed, breifly, and compression should be evident. strong popping noise of compressed air. a compression gauge is the proper test ( 4 strokes 125 psi) but if audible compression is heard without a doubt, more than likely fine. w spark and compression seeming ok, next is possible fuel, (injector) or intake leak, leaning ouy cylinder. try this and let me know. James White White Automotive, ASE tech, 17 yrs exp.

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1 Answer

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1 Answer

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Need to check coil pack, spark plug wire's for spark, also replace spark plugs if not replace yet.

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