Question about 1999 Toyota 4Runner

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Just overhauled Toyota 2000 5L Engine. It is starting but misfiring. Replaced injectors pump but still the same??

Posted by Anonymous on

  • Raymond A. Yoder Sr. Jul 15, 2010

    Hi,are you sure you have a 5L engine in it.I don't show a 5L for that year.Thanks,iluv2fish........Ray........

  • Demedo Hutchinson
    Demedo Hutchinson Dec 05, 2013

    check the valve clearances and bleed injectors

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Check the firing order and the gap on the plugs

Posted on Jul 31, 2010

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I have a Toyota Hilux 2.8 diesel 3l engine injector pump has great pressure on only 3 cylinders but number 4 is lacking pressure enough to make it miss , what can corse this problem


You didn't say but presumably the engine uses a DPA type or distributor type injection pump.

In this case the injector line pressure is governed by the condition and setting of each injector. If the break-off pressure of an injector is set to 80 atmospheres that pump element will produce a pressure of 80 atmospheres.

If one injector becomes "soft" and worn so the break-off pressure has fallen to 20 atmospheres for instance, or if the injector sticks open, the pressure generated by the pump will be either 20 atmospheres or virtually nothing.

When a conventional diesel engine develops a misfire, best practice is to ensure valve clearances and suchlike are in order, the compression pressure is good and then independently test the injector (and heater plug).

If everything is in order the pump should be removed for testing, repair and recalibration.

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Number 4 cyl. misfire/ 2.4rz engine/98 toyota p.u. how to fix misfire of number 4 cyl.on toyota 98 tacoma p.u./2.4rz engine


check compression, check valve clearance, check injector for properly working, check for vacuum leak around this cylinder.

Feb 10, 2015 | 1998 Toyota Tacoma

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I have a 1996 GMC Jimmy that was iddling very rough and code said cylinder 2 misfire check engine light was on solid. Replaced all plugs, wires, cap and fuel filter 1st of March 2013. It ran better for a...


Lets start at the beginning. Did anyone check fuel pressure before and after replacing the pump ?
Has anyone checked the fuel pressure regulator and the injector spider ? The 4.3w engine uses a spider with one injector that supplies all 6 cylinders. And it runs at 65psi or more.

Aug 05, 2013 | 1996 GMC Jimmy

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Can someone please give some input on my 6.0 troubles. F Power stroke , 6.0 2005 truck had a misfire, replaced set of 8 injectors . after completing replacements of injectors., Injectors pulse rating but...


the 6.5 and 6.6 diesel engines has electronic control pump.more likely the need diagnostic equiopment to reset injection pump timing before engine will start.

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I have a '03 Toyota Celica GT-S with a annoying mis-fire. Started small by replacing all spark plugs - nothing. Replaced the MAF sensor - nothing. Took it to a authorized toyota shop & checked...


Replaced the MAF sensor - nothing. Took it to a authorized toyota shop & checked compression which check out good and put the computer on. Computer read mis-fire on cylinder 1, and then multiple misfire (like it would jump around). We went ahead and replaced the fuel injector on cylnder 1 - did not solve problem as when we hook the computer up, misfire seemed tp stay at idle and seem better when running high RMP, but check engine light is on as it never went away. Went ahead and replaced the coil pack to cylinder 1 - nothing. what am i missing?

Feb 06, 2011 | 2003 Toyota Celica

3 Answers

CODES-PO301-PO303-PO316- CHANGED PLUGS & WIRES. STILL MISS ON START UP, GOES AWAY MOST OF THE TIME ABOVE 1000 R.P.M


P0301 - Cylinder 1 Misfire Detected.

Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak

Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

P0303 - Cylinder 3 Misfire Detected.
Follow info from P0301.

P0316 - Misfire Occurred In The First 1,000 Engine Revolutions.

Causes:
- Damaged CKP sensor.
- Ignition System.
- Fuel Injectors
- Running out of fuel
- Fuel Quality
- Base engine
- Damaged Powertrain Control Module

Solutions:
Usually the P0316 is combine with a P03XX codes. The P03XX code indicates in which cylinder the misfire occurred.

Jan 17, 2011 | 2002 Mercury Sable

1 Answer

Giving a 300 and a 301 code where do i start sounds fine when started and then when you put in gear it start misfiring


P0300 - Random / Multiple Cylinder Misfire Detected

Possible Causes:
- Improper spark plug
- Insufficient compression
- Incorrect fuel pressure
- The injector circuit is open or shorted
- Fuel injectors may be faulty
- Intake air leak

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plugs
- Replaced Injectors
- Replaced Ignition Coils

P0301- Cylinder Number 1 Misfire Detected

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Most likely your issue is with cylinder number 1. Follow the info I have provided and you should be able to solve this issue.

Jan 14, 2011 | 2002 Toyota Tacoma

1 Answer

Tacoma 4cyl idles rough, heditates, multiple misfires


Possible fuel delivery problem, fuel pump, fuel line, clogged fuel filter, leaking injectors or injector O-rings, faulty pressure regulator etc. Check your fuel pressure.

Jun 20, 2009 | 1998 Toyota Tacoma

1 Answer

1994 Toyota Corolla hard to start when warm


does it have a cold start injector seperate from the other injectors usually on the upper intake somewhere with a fuel line going to it

Apr 08, 2009 | 1994 Toyota Corolla

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