Misfire: need help troubleshooting!

Reply Subscribe

Thread Tools

Search this Thread

Feb 19, 2008 | 06:48 PM

#31

rysbrnr

Thread Starter

Rookie

Joined: Jul 2005

Posts: 75

Likes: 0

From: Iowa

Quote:

Originally Posted by PetesLS400

My moms car ended up just having a bad #5 injector, all fixed and running 100% again.

That's good to hear that this thread helped someone else also.

My problem will be fixed once I get another injector. I just haven't had time in the past few days... living in Iowa and dealing with these relentless snowstorms hasn't given me much motivation to get this RWD car back on the road. I'll just keep driving my truck for now.

Mar 4, 2008 | 07:50 AM

#32

rysbrnr

Thread Starter

Rookie

Joined: Jul 2005

Posts: 75

Likes: 0

From: Iowa

I forgot to update this in case somebody else could use this info in the future. I replaced the suspect injector and now my car runs like a champ. No more rough shakey idle!

I ended up getting an injector from rockauto.com whom distributes GB Remanufacturing. GB reconditions OEM fuel injectors. I could've bought a brand new injector off rockauto.com's site but they were aftermarket brands. I wanted the EXACT factory Toyota issued DENSO injector. For only $29 plus shipping I got a OEM Denso reconditioned injector with the exact flow rates and specs as spec'd by Toyota. In the near future I will send all 8 of my matching injectors off to get cleaned, balanced/blueprinted.

Mar 4, 2008 | 08:18 AM

#33

FrankT

Instructor

Joined: Nov 2005

Posts: 1,001

Likes: 51

From: Mountainair, NM

way to go...

Threads like this make this forum invaluable.

Mar 4, 2008 | 12:24 PM

#34

sockfocks

Lexus Test Driver

iTrader: (1)

Joined: Sep 2004

Posts: 833

Likes: 7

From: Oklahoma

Thats cool man...glad you got it running smooth again!!!

Mar 5, 2008 | 05:57 AM

#35

TRD911

Lead Lap

Joined: Apr 2007

Posts: 522

Likes: 7

From: sc

Quote:

Originally Posted by rysbrnr

I will send all 8 of my matching injectors off to get cleaned, balanced/blueprinted.

Really? They do this to injectors? sounds crazy

BP

Mar 5, 2008 | 07:10 AM

#36

rysbrnr

Thread Starter

Rookie

Joined: Jul 2005

Posts: 75

Likes: 0

From: Iowa

Quote:

Originally Posted by TRD911

Really? They do this to injectors? sounds crazy

BP

There's a couple places that'll do this. They'll ultrasonically clean, preliminary flow test, clean again, test again until all of your injectors are flowing at the same rate. Plus they will outfit your injector with new pintle caps, o-rings and filter baskets. It costs roughly $16-$17 per injector.

check out these shops for details

www.cruzinperformance.com
or
www.witchunter.com

i have no affiliation with either one of them, just found them online.

Jun 14, 2008 | 04:54 PM

#37

SCoupe

Lexus Test Driver

Joined: Aug 2003

Posts: 887

Likes: 0

From: California

www.witchunter.com Does excellent work, I'm a repeat customer, they've always had one business day turn around time. I've sent in two set of injectors. The variance in flow was proven to be as high as 8% before and within 1% after. The work is first rate and this is a great way to have your injectors operating at peak performance.

Jun 14, 2008 | 05:52 PM

#38

jcat_350

Lexus Champion

Joined: May 2008

Posts: 3,347

Likes: 6

From: RI

i had a pretty bad misfire problem with my 99 maxima a while back...while it's a very different engine it ended up that oil was somehow making its way into the spark plug shaft (the VQ30DE is a coil-on-plug setup), as well as the plug-to-coil connector boot seemed to be cracked and so the spark pulse was arcing against the wall of the shaft before it got to the plug, causing a serious misfire. We ended up just ripping apart basically the whole top end, cleaning everything, resealing it and putting it back. Took care of the oil part but the 6 connector boots (little rubber pieces) would have cost me almost $300, and the remaining, very sporadic misfire was not such that it was costing me extra fuel or even happening very often. In retrospect i would have gone at the injectors and head gasket next, as the car had 145k.

dunno if that maybe sparks a new path for you; my recommendation would be to just go back over everything, top to bottom as if you had a fine tooth comb, just look for every tiny stupid little thing that could throw the engine off. These engines are pretty sophisticated and very fussy, the slightest error will cause huge issues. haha the new lexus commercial about cylinder tolerances with the dust is not an exaggeration.