seince I have installed these spark plugs IT has been at least 3 weeks now that after my 3rd trip my mil lite starts flashing and it flashes for a while then it goes on.
this puts it in limp mode and my odb2 scanner pulls300 301303305&300 codes? I have cheched & cleaned my EGR Its ok ,installed new plug wiers when i did the plugs. I also had the heads replaced w/2004 high output heads that the hiend sports packages had.to tttop it all, is the pcm is a OEM HO pcm from dodge.NEW COIL PACK I haaave even pressure tested the cooling system and rechecked my compression no head gasket leaks its as tight as it can be? what am I missing? please your help will be of value to this hobby mech. thank you.
2007-01-16 11:58:08 · 9 answers · asked by Anonymous in Cars & Transportation ➔ Car Makes ➔ Dodge
Most likely, we get cars all the time with mis-fire codes in my dealership that have been caused by use of other plugs.. Chrysler vehicles were made to run on the plugs the vehicle came with..( resistance, heat-range, etc..)
Didn't the Hi-output heads have smaller combustion chambers? This may be another problem due to really high compression for what fuel and timing you are using.. I would contact the guys over at KRC performance and ask their opinion..
http://www.krcperformance.com/krc/
2007-01-17 03:10:53 · answer #1 · answered by Richie Rich 3 · 0⤊ 0⤋
After working as a gold certified dodge tech for 5 years I have seen repeated misfire failures both with bosch platinum and ngk platinum spark plugs. I would recommend the OEM spark plugs of the proper heat range to see if your misfire DTC go away. Looks like all the cylinders dropped misfire codes?
You retrieved PO300 (multiple misfire) PO301 (Cyl 1 misfire) 3 and 5 respectively. another thing that comes to mind is that all these misfires are comming from the same side of the engine, the #1 Bank. Be sure the intake gasket didn't slip on that side when installing the manifold... check for vacuum leaks. Seems too much of a coincidence that you have misfires only on one side of the engine...
2007-01-16 13:21:43 · answer #2 · answered by Ranger 1 · 0⤊ 0⤋
Looks like you have wasted a lot of time and money on a bad problem. Always do the easy and cheap stuff first. Throw away those plugs, go to the dealer if necessary and buy direct replacement plugs for your engine. The HO heads may require a different heat range than the originals, so take that into consideration.
2007-01-20 07:43:21 · answer #3 · answered by eferrell01 7 · 0⤊ 0⤋
properly in reality if the spark challenge has been dealt with and also you've black/sooty plugs, and from what I save in recommendations from the former days after we had carbs that fed each cylinder i'd risk a wager that you've gotten a gas injector challenge , no longer quite uncommon on a motor vehicle that previous. you quite opt for a test device and a minimum of a few hrs and abilities and equipment to even start up to envision an electric powered or injector difficulty. no longer quite positive in this yet i have self assurance this engine has 3 coils that fireplace 2 cyls each and each each rev , which signifies that 2 and 5 hearth each rev and one is a dull hearth. you want the test device and start up plugging issues till you discover which one clears it . you also favor to sparkling the codes ever so many times of what you probably did or it gained't take position as being cleared first and could take 20 + key starts to sparkling. only a authentic longshot right here yet verify your knock sensor with the test device once you're driving.
2016-11-24 22:06:50 · answer #4 · answered by ? 4 · 0⤊ 0⤋
In my 25 years plus of working on cars and motorcycles I can tell you the 2 crappiest plugs on the planet are Bosh and NGK, throw those peices of you know what in the trash and get some Champion or Autolite platinums. The codes you metioned are misfires on cylinders. That tells you the garbage plugs are misfiring. Period!!!
2007-01-17 14:23:59 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Ihave a friend with a 3.8 Buick. he put in bosch plugs and had alot of starting and misfire problems. Switched to Champion plugs and has not had a problem since.
2007-01-16 12:12:14 · answer #6 · answered by Anonymous · 1⤊ 0⤋
Bosch plugs are made for high performance, high compression engines and not really for any American car. I once had a Dodge Power Wagon and before I discovered this, I tried some Bosch plugs and they wouldn't work at all.
2007-01-16 14:39:20 · answer #7 · answered by Anonymous · 0⤊ 2⤋
Start with replacing those crappy plugs. Get you some AUTOLITES and go from there.
2007-01-16 12:02:18 · answer #8 · answered by kakl1104 2 · 1⤊ 0⤋
Timing or firing order
2007-01-16 12:09:19 · answer #9 · answered by Anonymous · 0⤊ 0⤋