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Diagnostic tool says random multiple misfires on all eight cylinders. This after timing belt was changed at mechanics shop. 2002 toyota tundra 4.7

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You may have to erase the codes with a scanner,or code reader,then if it persist,have the mechanic recheck the alignment of the timing.If the belt had jumped,or broken ,then there might be some valves bent,if the engine is running poorly,if not,and this was a maintenance thing,check the fuel pressure,it sounds strange sense he just replaced the timing belt,so have him find out what the problem is.

Posted on Jul 18, 2010

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I have Codes po300,po303,po303pd toyota 4 runner


P0300 - Random/Multiple Cylinder Misfire Detected or Misfiring Of Multiple Cylinders
P0303 Cylinder 3 Misfire Detected

Sep 13, 2014 | 1997 Toyota 4Runner

1 Answer

1,3,5,7 cylinder miss fire


Bank1 failure.

my guess, those DTCs off a cheap scan tool>? why not post source and real codes, no lie P0301 is real. but off what?

real engine: Name.

4.7 L 2UZ-FE V8

VVT-i variant??? got VVT? IF ONE SIDE FAILS, misfire there. if cam retarded. if bad, can be 14deg retarded, (huge)

see cam action here.

http://www.mr2.com/files/mr2/techinfo/Random%20FSM%20Data/2uz-History.pdf





2003 Tundra.

if using a full real scan tool that sees all toyota extended DTCs , you might see VVT errors, $20 tools and lame autozoned , blind .

there are 4 sensors there, id bet there are codes you missed!



P0301,3,5, and 7, DTC, ONLY?

bad coil packs? no.



thats the whole left bank, bad.

RF 2-4-6-8

LF 1-3-5-7

so, VVT bad on left bank or coil pack ,

yours has 8 COP coils, so its not 4 bad COPS.

a real mech sees all this in 1 second , online, impossible

nor country. sold.\'



could the timing belt slip only on one side

did you do timing belt service, on time, if not, bingo.



misfire is

bad compression (vvt?)

bad spark , no, not all 4

bad fueling, but there is only 1 maf/map, and one full injection rate there so not fuel mix.related.



here is a tool (most AZ stores clueless)

that reads the enhanced DTC of Toyotas



http://www.amazon.com/gp/product/B001QIUGVI/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1#productDetails



using a 1996 tool , misses the boat.

but id bet your VVT is bad. left bank.

the real tool might help. here.

P1349

P0011 Diagnostic Trouble Code Discussion for
Camshaft 1 Position Sensor Target Performance
P0012 << or this>? P0020/21/22?



the FSM shows the manual tests for these VVT parts.

Feb 14, 2014 | 2003 Toyota Tundra

1 Answer

Random multiple misfire P0300, P0302, P0304 on 2006 Kia Rio


A competent mechanic will check all probable causes associated with these DTC codes.
Code P0300: Random-Multiple misfire detected. Probable causes:
1. Vacuum leaks, damaged hoses, or improper routing
2. Fuel contamination
3. Ignition system - Ignition module, coil, spark plugs and wires
4. Fuel system
Code P0302: Cylinder 2 misfire detected. Probable causes:
1. Control unit software in need of updating
2. Faulty PCM or ECM
3. Faulty fuel injector
4. Ignition system
5. Fuel system
Code 0304: Cylinder 4 misfire detected. Probable causes:
1. Control unit software in need of updating
2. Faulty PCM or ECM
3. Faulty fuel injector
4. Ignition system
5. Fuel system

Be sure the invoice enumerates all of these probable causes as having been checked. Also, some of the replacement parts installed earlier may be faulty.

Jan 19, 2014 | Kia Cars & Trucks

1 Answer

1998 Hyundai Accent p0300 random multiple misfire


that particular vehicle has a distributor-less ignition system. completely stand alone and electronic. change around the known good coils and see if the misfires on the computer change. see, what the trouble codes say is your numbers 1 thru 4 cylinders are misfiring inadvertently. if you move the coils around, which there are 4..one to 2 cylinders and if its 4 bad coils giving problems then the codes will move around. it could be the crankshaft tone wheel or the PCM as well. take it to a good diagnostic facility like a hyundai facility if you want it fixed right the first time. the hyundai parts are a little more expensive but they are the BEST part for your car, OEM parts are the way to go and the mechanic has probably seen this before and can tell you whats wrong before you leave easily.

Nov 13, 2013 | Hyundai Motor 1998 Accent

1 Answer

I would like to know what does this codes means 300 302 303 304 305 and what to do to fix it. I have change the sparks and cables, the coils and the Orings of the ingectors. please help me


P0300 random/ multiple misfire detected
P0302 misfire cylinder #2
P0303 Misfire cylinder #3
P0304 Misfire cylinder #4
P0405 Misfire Cylinder #5

This is pretty common thing, and if you have already changed out the wires, coils, and and plugs then you maybe having trouble with the ECU. The good news is that there are local shops (not as expensive as dealerships) that can either flash or replace your ECU. If you don't have a local shop in your area that does this kind of work, then you will be stuck with the dealership.

Good luck,
--Zim--

Jun 02, 2011 | Toyota Corolla Cars & Trucks

1 Answer

Piston missing code 0300 comes up 2000 tundra on 90,000 miles


po300 code is a random cylinder misfire. start with checking the plugs, plug wires, coil packs, make sure no plug wires are touching exhaust manifold. If it is none of these you might want to take it to a mechanics shop or dealer. might be something internal like leaking valve/s, start with the simplest things hopefully you can find problem.

Jan 14, 2011 | Toyota Tundra Cars & Trucks

1 Answer

I am workiing on a 1999 toyota carolla has a misfire


Here is a good site for OBD II trouble codes.  P0300: Random/Multiple Cylinder Misfires Detected, P0301: Cylinder 1 Misfire Detected, P0304: Cylinder 4 Misfire Detected.

Jan 25, 2009 | 1999 Toyota Camry

4 Answers

Diagnostic codes for 200 Daewoo Lanos..........


Do you feel a misfire?? Random misfires are usually caused by a lean fuel mixture, the reasons that cause this a to many to list here.

Jul 23, 2008 | 2002 Daewoo Lanos

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