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Misfire Cylinder 4 - Fuel Rail Wiring Harness?

I have a misfire in cylinder 4. I replaced the following: plugs, wires, coil pack, injectors, ran fuel line cleaner. Still have a misfire in cylinder 4, all I can think that it might be the Fuel Rail Wiring harness (electric wires that plug into the injectors). It looks lightly burnt from heat in sections. I purchased a code reader and it says Pending code cylinder 4. When I replaced the injectors which was the last thing I replaced the van had no codes and then 2 days later I had the check engine light again. Im think maybe I shorted the old wire out when I installed the NEW injectors (the witre is almost 10 years old). It almost feels as if the wire has a short (if the wire is even the problem) because it feels like I have fuel power at one minute and loss of power the next. Sometimes the check engine light comes on solid and sometimes it blinks and goes away. Does anyone agree or have any other suggestions? I order a new wire harness just waiting to receive it. Im strapped for cash and this was my fathers vehicle (he passed away in june) so Im trying to do the repairs myself to cut cost but to also keep the van up and running as long as possible. Thanks in advance to everyone.

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Fuel Rail Wiring Harness

salvage yards or online

Posted on Nov 16, 2009

monkeybear45
  • 94 Answers

SOURCE: I have had a Check Engine Light on my dash for a

I agree with phillyboy. Don't buy a compression gauge though. Pay a garage to check your compression. $40 or so.There are three rings on a piston, a compression ring, an oil ring and another compression ring. If your rings have failed on cylinder 4, that would explain the oil on the spark plug. The oil that is building up on the spark plug is probably causing the misfire and subsequent code.

Posted on Nov 30, 2009

  • 226 Answers

SOURCE: Misfire Code/Check Engine Light. Many Repairs,Cant Clear the code

My guess on this is gonna be a cracked ignition coil. Have it tested by someone. It is very common for these coils to crack and cause a misfire.

Posted on Feb 26, 2010

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1 Answer

Have a misfire in cylinder 6 changed all coil packs all spark plugs stills says cylinder 6 misfire


A misfire could be caused by almost anything, spark--fuel--compression. Did you check for spark at number 6? All electrical components have voltage and ground, if problem on wiring circuit, replacing the component won't fix it.
Also, check for fuel injector pulse--proper fuel pressure and cylinder compression.
I don't know year--make--model, it didn't post for some reason?

May 16, 2016 | Cars & Trucks

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2012 V6 Frontier misfire cylinder 4, new fuel injector didn't fix the issue


If it has a coil for each cylinder then it could be the coil on that cylinder but if it doesn't then it could be plug wire,sparkplug or fuel injector related ( injector wire harness or pigtail ).

Mar 27, 2014 | Nissan Frontier Cars & Trucks

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2008 Cadillac CTS returning P0303 after replacing spark plug and coil pack


Error Code: P0303
Description:
Cylinder 3 - Misfire Detected
Possible Cause:
Wiring harness, igniter and fuel injector connectors.
Ignition system. (Spark plugs gaps)
Fuel injector No. 3.
Fuel pressure.
Running out of fuel.
EVAP canister purge valve.
Evaporative emission system.
Low compression, cylinder No.3. (check valve clearance and throttle plate for excessive wear)
Engine control module (ECM).

Feb 27, 2014 | 2008 Cadillac Cts

1 Answer

Code p0303


SWAP COIL PACKS to another Cylinder... See if it Follows the Coil Pack

2nd, Swap the INJECTOR to another Cylinder.. See if it follows the Injector.

You will get your Answer

Apr 12, 2013 | 2003 Mitsubishi Galant

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Got a p0304 code come up on my 2002 olds Bravada, replaced camshaft and it still didnt fixed it?


P0304 Code - Cylinder #4 Misfire Detected
A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4.

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: A code P0304 may mean that one or more of the following has happened:
* Faulty spark plug or wire
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector
* Burned exhaust valve
* Faulty catalytic converter(s)
* Running out of fuel
* Poor compression
* Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.


Hope helps.

Apr 09, 2011 | 2002 Oldsmobile Bravada

1 Answer

2003 Hyundai Sonata with 4 cyl. PO301 error code. Have replaced spark plugs, wires, coil packs, and mass air flow sensor. Replaced air filter due to heavy gas smell. Car was starting after tapping gas 3...


P0301 - Cylinder 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

Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.

Jan 17, 2011 | Hyundai Sonata Cars & Trucks

1 Answer

Fuel Rail Wiring Harness


salvage yards or online

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