Misfire frustration

[John P.]

Hello everyone, It's been awhile since I've posted. I'm having a misfire issue on cylinder #1. It started about a month ago after towing a U-Haul trailer around helping the kids move into their new apartment. I had already planned on upgrading my fuel injectors to the Denso 4 hole injectors and did install those into my KK no issues (didn't expect them to be the source of my misfire). To tackle the misfire I installed New NGK plugs even though I only had about 12k on the set, installed New MSD coils, and New AC Delco brand plug wires. The misfire persists. Symptoms are after sitting an hour or so it will misfire upon restarting. Lasts about 5-10 seconds and then runs perfectly. The longer it sits, the worse the misfire is. Sitting overnight or longer usually results in a dead mis until the 5-10 seconds elapse and it clears up. Any thoughts? I'm leaning towards head gasket as I am not having any issues with the TPCM.

 

[KJowner]

Swap the injector round and see if the misfire moves.

 

[Dave_too]

cracked head is an unpleasant possibility as well.

 

[Xterra4x4]

Hello everyone, It's been awhile since I've posted. I'm having a misfire issue on cylinder #1. It started about a month ago after towing a U-Haul trailer around helping the kids move into their new apartment. I had already planned on upgrading my fuel injectors to the Denso 4 hole injectors and did install those into my KK no issues (didn't expect them to be the source of my misfire). To tackle the misfire I installed New NGK plugs even though I only had about 12k on the set, installed New MSD coils, and New AC Delco brand plug wires. The misfire persists. Symptoms are after sitting an hour or so it will misfire upon restarting. Lasts about 5-10 seconds and then runs perfectly. The longer it sits, the worse the misfire is. Sitting overnight or longer usually results in a dead mis until the 5-10 seconds elapse and it clears up. Any thoughts? I'm leaning towards head gasket as I am not having any issues with the TPCM.

Could be MAP sensor in front on intake manifold, see YouTube for location, not to bad of a job. Also see Youtube

 

[Xterra4x4]

Could be MAP sensor in front on intake manifold, see YouTube for location, not to bad of a job. Also see Youtube

Also my 2004 had a misfire and replacement solved problem

 

[John P.]

You must be registered for see images attach

 

[John P.]

Well, solved it. It's a head gasket issue. Can't post all of the pictures but it appears to only be leaking from the gasket itself. But hey, The cross hatching looks pretty good for 136K

 

[Xterra4x4]

Hello everyone, It's been awhile since I've posted. I'm having a misfire issue on cylinder #1. It started about a month ago after towing a U-Haul trailer around helping the kids move into their new apartment. I had already planned on upgrading my fuel injectors to the Denso 4 hole injectors and did install those into my KK no issues (didn't expect them to be the source of my misfire). To tackle the misfire I installed New NGK plugs even though I only had about 12k on the set, installed New MSD coils, and New AC Delco brand plug wires. The misfire persists. Symptoms are after sitting an hour or so it will misfire upon restarting. Lasts about 5-10 seconds and then runs perfectly. The longer it sits, the worse the misfire is. Sitting overnight or longer usually results in a dead mis until the 5-10 seconds elapse and it clears up. Any thoughts? I'm leaning towards head gasket as I am not having any issues with the TPCM.

Could be a bad new coil you replaced!

 

[Xterra4x4]

Could be bad (new coil)

 

[dtennes]

Hello everyone, It's been awhile since I've posted. I'm having a misfire issue on cylinder #1. It started about a month ago after towing a U-Haul trailer around helping the kids move into their new apartment. I had already planned on upgrading my fuel injectors to the Denso 4 hole injectors and did install those into my KK no issues (didn't expect them to be the source of my misfire). To tackle the misfire I installed New NGK plugs even though I only had about 12k on the set, installed New MSD coils, and New AC Delco brand plug wires. The misfire persists. Symptoms are after sitting an hour or so it will misfire upon restarting. Lasts about 5-10 seconds and then runs perfectly. The longer it sits, the worse the misfire is. Sitting overnight or longer usually results in a dead mis until the 5-10 seconds elapse and it clears up. Any thoughts? I'm leaning towards head gasket as I am not having any issues with the TPCM.

How many miles on the odo?

 

[Xterra4x4]

How many miles on the odo?

I this on a jeep liberty 3.7? If so did you change the MAP sensor? It can cause a mifire if bad!

 

[John P.]

I this on a jeep liberty 3.7? If so did you change the MAP sensor? It can cause a mifire if bad!

It was the head gasket, see above photo

 

[Xterra4x4]

Could be a bad new coil you replaced!

What year is Liberty? On my 2004 I have coil packs!

 

[John P.]

What year is Liberty? On my 2004 I have coil packs!

Mine is a 2011 it has three coil packs. Each one operates 2 cylinders

 

[Xterra4x4]

Mine is a 2011 it has three coil packs. Each one operates 2 cylinders

What code comes up? Did change MAP sensor