I recently replaced the computer in my 2002 Toyota 4-runner. Now my car is again misfiring and my mechanic says one of the cylinders is shot. Is this something they could've found when my spark plugs were also replaced?

Asked by Nov 10, 2015 at 07:52 PM about the 2002 Toyota 4Runner SR5 4WD

Question type: Maintenance & Repair

In diagnosing the computer problem, my mechanic went over my car
thoroughly before diagnosing the computer malfunction.  Shouldn't he have
noticed a faulty cylinder?

6 Answers

52,725

If your computer was malfunctioning then your mechanic may not have been able to detect the misfire. What exactly do you mean by a faulty cylinder?

3 out of 3 people think this is helpful.

Really... a shot cylinder can mean sooooo many things

2 out of 2 people think this is helpful.
52,725

Hi Ford!

2 out of 2 people think this is helpful.
63,305

Yes, you're mechanic should have seen the misfire by the condition of the spark plug(s) of the effected cylinder(s). In the old days that was called "reading the plugs". A misfire can also be detected at the tailpipe. A steady exhaust stream indicates that all cylinders are firing normally. But a " putt-putt-putt" at the tailpipe is an indication that the engine is misfiring. HTH. -Jim

1 out of 1 people think this is helpful.

Hi back at ya FoR and Jim

2 out of 2 people think this is helpful.
63,305

Hi Fordnut! -Jim

Your Answer

Add photo

Related Questions

  • What is function of knock sensor in toyota 4-runner 2 answers

    2005 4-Runner runs rough on start and then check engine light comes on with VSC tracking lights. Wondering if it could be knock sensor and what is the function of a knock sensor.After a few seconds ...

    2005 Toyota 4Runner Limited V6 4WD

    -

    Maintenance & Repair

  • 2004 Toyota 4runner v6 cylinder 4 misfire 4 answers

    So on my 04 Toyota 4runner sr5 v6 it's been throwing a cylinder 4 misfire so I decided to replace the plugs and the number 4 coil pack but still no fix then I switched the new coil pack for anothe...

    2004 Toyota 4Runner SR5 4WD

    -

    Maintenance & Repair

  • 2008 4 runner 8 answers

    Had 4 runner at shop, they said they fixed engine light and vac lights that were on, but I drive about 50 miles it comes back on. Now the maintence history has been wiped clean out of system but l...

    2008 Toyota 4Runner SR5 V6

    -

    Maintenance & Repair

  • 2002 Toyota 4 Runner whining noise in drive shaft area 7 answers

    Whirling/whining noise from the rear drive shaft area at speeds between 25-50 mph. Had a shop do an initial check and they used a stethoscope to determined that the noise was coming some place betwee...

    2002 Toyota 4Runner Limited 4WD

    -

    Maintenance & Repair

  • toyota 4 runners 5 answers

    I have been wanting to purchase an early model to mid model 4 runner to play in the mountains with and take camping. But i have been told over and over to stay away from the 3.0 v6 motors. Does any on...

    1992 Toyota 4Runner 2 Dr SR5 V6 4WD SUV

    -

    Shopping & Pricing

4Runner

Looking for a Used 4Runner in your area?

CarGurus has 20,422 nationwide 4Runner listings starting at $2,700.

ZIP:

Search Toyota 4Runner Questions

Toyota 4Runner Experts

#1 Kurt Burton
Kurt Burton
Reputation 1,150
#2 azurro
azurro
Reputation 650
#3 kbro
kbro
Reputation 610
View All

Related Models For Sale

Used Toyota Tacoma
550 Great Deals out of 37,845 listings starting at $1,995
Used Toyota Highlander
321 Great Deals out of 24,060 listings starting at $2,900
Used Jeep Grand Cherokee
842 Great Deals out of 70,149 listings starting at $700
Used Toyota Tundra
529 Great Deals out of 32,374 listings starting at $3,499
Used Chevrolet Tahoe
643 Great Deals out of 27,669 listings starting at $600
Used Toyota RAV4
570 Great Deals out of 66,132 listings starting at $999
Used Toyota Sequoia
136 Great Deals out of 5,500 listings starting at $2,999
Used Honda Pilot
337 Great Deals out of 20,441 listings starting at $2,199
Used Toyota Land Cruiser
15 Great Deals out of 1,163 listings starting at $3,995
Used Ford Explorer
756 Great Deals out of 74,254 listings starting at $750
Used Nissan Pathfinder
310 Great Deals out of 22,794 listings starting at $2,250
Used Ford F-150
2,387 Great Deals out of 209,709 listings starting at $895
Used Jeep Wrangler
286 Great Deals out of 19,017 listings starting at $3,295
Used Toyota Camry
852 Great Deals out of 90,788 listings starting at $1,200

Used Cars For Sale

2017 Toyota 4Runner SR5 4WD For Sale
1,045 listings starting at $33,675
2016 Toyota 4Runner SR5 4WD For Sale
19 Great Deals out of 1,809 listings starting at $28,499
2015 Toyota 4Runner SR5 4WD For Sale
17 Great Deals out of 470 listings starting at $22,995
2014 Toyota 4Runner SR5 4WD For Sale
4 Great Deals out of 252 listings starting at $25,000
2013 Toyota 4Runner SR5 4WD For Sale
5 Great Deals out of 284 listings starting at $18,995