Question about 2000 Jeep Grand Cherokee

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Have 2000 limited 4.7. Has engine light on and checked codes,says #3 & 6 misfire. changed coils. but still have light and runs rough at 65-69 mph. A little rough at stop.

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Why would someone even start with changing the coils...usually a misfire is due to bad spark plugs..replace spark plugs, then go from there...just for a personal reference, the next time you want to see if your coils are bad, simply change out your bad two coils with two coils on the other side of the engine that are good...if they misfire code changes, then you know its a coil...if not, plugs...

Posted on Nov 17, 2009

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Posted on Jan 02, 2017

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hi , if you are sure the no. 6 cylinder is misfire then change the ignition coil if you are sure but if you are going to buy a new coil better buy all 6 coils and it will last longer if not after no.6 then no.5 or 4,3, until you change all of it .....for rough runs pls flush / change ATF every 20,000 km and change engine oil every 5,000 km , change the exhaust (o2) sensor it make a lot of different , resetting your throttle sensor and speed sensor , all the above must change it with nissan oem part and it not that expensive too.


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Remove the intake manifold, if necessary & change
the other 3 plugs & coils,assuming a V6, if not then the
codes were wrong & you did the wrong coils

No code tells you what to replace,only component testing does


Most likely been in there for 10 years

Replace the front O2 Sensors--their only good to 100,000 miles
Leave the rear monitors in converter outlet

Don't waste your money on putting something in the fuel tank
That is never a repair & is diluted 12 or 16 oz to 15 gallons
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Probably pay the replace the EGR Valve if not done already

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Hope this helps.

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firewall

4 - 8

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2 - 6

1 - 5

front

The spark plug firing order is 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 Make sure the coil is good.

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