P0300 - 306 Saga FIXED!!!!!!!! no help from dealer

Jeep Dawg · **Posted:** Fri Jul 31, 2009 5:38 pm

OK:
Took it into the dealer. They said 2 coil packs were shot. -REPLACED.
2 days later CEL flash again KJ runs like crap. Code shows P0300 - 306

I decided to replace the other 4 coil packs and reset PCM.
2 days later CEL flash again. I had enough. I brought it back to the dealer last night. 2 hours ago they said they can not figure out the problem. Everything checked out fine. I asked about the possiability of the PCM, they daid MAYBE.
They did mention that I was 4 wheeling thoe. They said they found some dry mud in my skid plate and what looks like a splash residew in the engin bay. (WELL NY WE BEEN HAVING FLOODS and my road was FLOODED!) ANY WAY------they seem not to be able to do anything more.

My problem basicaly happens on a DECEL coming down a hill when I let off the gas for a moment then step on the gas to maintain speed.......

WHAT IS THE PROBLEM??????????

BugginKJ · **Joined:** Mon Jul 06, 2009 7:35 pm **Posts:** 4576

So what if you were 4 wheelin, isn't that what you bought a 4wd for? What are they going to tell someone with a Vette, looks like you have been speeding? Dealers :roll:

Jeep4me99 · **Posted:** Fri Jul 31, 2009 7:38 pm

have you ever looked into the camshaft position sensor. MY Kj ran like crap when that went bad. It would stall too. But I got a code for that along with some misfire codes. Happened about a week or two after wheeling in a lot of water.

Another thing to look into may be the wiring for the coil packs and the spark plugs. have you replaced the plugs lately? Are they gapped correctly?

Jeep Dawg · **Posted:** Fri Jul 31, 2009 9:05 pm

Jeep4me99 wrote:

have you ever looked into the camshaft position sensor. MY Kj ran like crap when that went bad. It would stall too. But I got a code for that along with some misfire codes. Happened about a week or two after wheeling in a lot of water.

Another thing to look into may be the wiring for the coil packs and the spark plugs. have you replaced the plugs lately? Are they gapped correctly?

I love the vette comment. I had a good laugh.

I have replaced the plugs, they are gaped correctly.
this problen first started over the winter. I replaced the plugs and all was well untill about a month ago. I checked all coil wires, coil packs (NOW ALL NEW), I have not been wheeling since 1st week in april. Compression test, this test, that test. I even did a caught test :lol:

So I have no freaking clue any more. The dealer is stumped, I am stumped.

Jeep4me99 · **Posted:** Fri Jul 31, 2009 9:47 pm

Jeep Dawg wrote:

Jeep4me99 wrote:

have you ever looked into the camshaft position sensor. MY Kj ran like crap when that went bad. It would stall too. But I got a code for that along with some misfire codes. Happened about a week or two after wheeling in a lot of water.

Another thing to look into may be the wiring for the coil packs and the spark plugs. have you replaced the plugs lately? Are they gapped correctly?

I love the vette comment. I had a good laugh.

I have replaced the plugs, they are gaped correctly.
this problen first started over the winter. I replaced the plugs and all was well untill about a month ago. I checked all coil wires, coil packs (NOW ALL NEW), I have not been wheeling since 1st week in april. Compression test, this test, that test. I even did a caught test :lol:

So I have no freaking clue any more. The dealer is stumped, I am stumped.

try changing out the crankshaft position sensor....it may make a diff. Its pretty cheap too if you do it yourself. $20 part I think...no special tools and is easily accessible on the engine block. worth a shot if you're having that much trouble

Guest · **Posted:** Fri Jul 31, 2009 11:07 pm

Anybody considered a worn out timing chain?

Just sayin'.

tjkj2002 · **Posted:** Fri Jul 31, 2009 11:16 pm

ThunderbirdJunkie wrote:

Anybody considered a worn out timing chain?

Just sayin'.

That would be a constant misfire on all 6 cylinders all the time,not just random ones on decel only.

But just typing that it could be a oil pressure problem if it is not a PCM problem.If the oil pressure is not high enough on deceleration to keep the timing chain tensioners pumped up properly it could cause a random misfire but only on decel.The 2 timing chain tensioners are only plastic but should outlast the chains in 99% of the 3.7's out there.

dirt pig · **Posted:** Sat Aug 01, 2009 12:53 am

Have you checked the following?

-Worn serpentine belt
-Binding Engine-driven Accesories : A/C Compressor, P/S pump, Water Pump
-Misalignment on the Water Pump, P/S pump and A/C Compressor Pulleys
-Corroded PCM power and ground circuits
- Improper CKP, CMP, MAP and TP sensor mounting
-Poor connector/terminal to component connection. ie CKP sensor, Fuel Injector, Ignition coil etc
-Vacuum leaks
-Restricted Air Induction system or Exhaust system

Jeep Dawg · **Posted:** Sat Aug 01, 2009 7:52 am

tjkj2002 wrote:

ThunderbirdJunkie wrote:

Anybody considered a worn out timing chain?

Just sayin'.

That would be a constant misfire on all 6 cylinders all the time,not just random ones on decel only.

But just typing that it could be a oil pressure problem if it is not a PCM problem.If the oil pressure is not high enough on deceleration to keep the timing chain tensioners pumped up properly it could cause a random misfire but only on decel.The 2 timing chain tensioners are only plastic but should outlast the chains in 99% of the 3.7's out there.

The dealer checked all the pulley's and s-belt along with time chain. All seems to be ok. Seems how this problem happens on a decel, I should look to the oil pump?
I have 140100 on motor right now. NEVER changed anything except AC compressor. (Problem happend before compressor burned out)

Jeep Dawg · **Posted:** Sat Aug 01, 2009 7:54 am

dirt pig wrote:

Have you checked the following?

-Worn serpentine belt
-Binding Engine-driven Accesories : A/C Compressor, P/S pump, Water Pump
-Misalignment on the Water Pump, P/S pump and A/C Compressor Pulleys
-Corroded PCM power and ground circuits
- Improper CKP, CMP, MAP and TP sensor mounting
-Poor connector/terminal to component connection. ie CKP sensor, Fuel Injector, Ignition coil etc
-Vacuum leaks
-Restricted Air Induction system or Exhaust system

everything was checked. no resolution

Jeep Dawg · **Posted:** Sun Aug 02, 2009 10:00 pm

Well after this weeneds rain cleared late this afternoon. I decided to change my plugs and replaced all coil packs (brought back to auto zone and got replacement warrante)
My old plugs had 25K CHAMPS and the wear looked like a GREAT WEAR. something that you would like to see. So I gaped .040 on factory req's NGK and while I was in the engin I decided to clean throd body and inspected all circuts/connections. I did find my MAP sensor had one loose screw. I adjusted that and I hope mybe that was my problem. We will see.

I will let you know in 200 miles. (Seems to happen at the 1st 200 mile mark after PCM reset)

dirt pig · **Posted:** Mon Aug 03, 2009 2:52 am

Sounds like you may have found the problem!!
Loose MAP sensor.

Also if you have been experiencing heavy rainfall/flooding you may want to give all your connectors a blast with a water-dispersing agent and a coating of De-oxit.

Jeep Dawg · **Posted:** Mon Aug 03, 2009 6:12 am

dirt pig wrote:

Sounds like you may have found the problem!!
Loose MAP sensor.

Also if you have been experiencing heavy rainfall/flooding you may want to give all your connectors a blast with a water-dispersing agent and a coating of De-oxit.

The way things are going, I am sure either that was not it or it is going to get worse.
I seriously have had it with this dam Jeep. Dealer can't tell me what is wrong except tell me my problem is from 4 wheeling. They said that because I had some dry mud in my skid plate. So they point the finger to that but not finding the problem

dirt pig · **Posted:** Mon Aug 03, 2009 7:20 am

Typical Dealer response.
Sounds like they are wiping there hands of it.
Take it to a mechanic who specialises in jeep.

Not a dealership.

If its not completely standard, they are completely confused and at most times, all they are capable of is the basic servicing requirements. I had a dealership install my lift, It took them 3 day's and didn't know what bumpstops were because they looked different to what came out of the factory!! :shock:

HaHaHa. I had to visit them everyday to oversee there progress and they were consulting me !!!! I should have charged them a consultancy, specialist fee. :wink:

Although in the back of my mind I was having a bit of a giggle because my KJ occupied a hoist for 3 days and I could slowly see the backlog of vehicles mounting up.

I think the manager was glad to see me leave.
He was happy that I helped the boy's through a learning curve, though. He said that they, now know what to do next time someone wants a lift install.

Albert · **Posted:** Mon Aug 03, 2009 12:27 pm

Brian, I hope this misfire is finally done. I wish we could have sorted it out between both of us and the FSM and code reader and swapping stuff around. I don't know what elce to say or do....... except now with new plugs and coil packs I got my fingers crossed.

That said, call my cell if you need anything I can possibly help with.

Jeep Dawg · **Posted:** Wed Sep 02, 2009 5:59 am

4 Weeks later and it still has not showen an P03xx code yet.
Looks like I got it.
I ended up replacing the rest of the coil packs and plugs.

The dealer INSIST that my problem was caused by 4wheeling and blamed mud splash on the engin bay. I should have used soap to fix the KJ then.

P0300 - 306 Saga FIXED!!!!!!!! no help from dealer

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