Question about 1992 Buick Century

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Fuel injectors How do I detect a bad fuel injector

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Hi there, well if you have a bad fuel injector the easiest way to check is if you have a misfire code come up then pull the spark plug out and with the wire connected to the spark plug, place the plug on metal on the motor and turn the motor over( make sure your wearing gloves when you do this, i wouldnt want you to get shocked) and if the spark plugs are firing then you narrowed it down to a fuel problem. next you can take an ohm meter or light tester and backprobe the pigtail while they are still conected to the injectors to make sure they have power and if they do you really narrowed it down to the injector being faulty or cloged

Posted on Aug 27, 2008

6 Suggested Answers

  • 202 Answers

SOURCE: Fuel injectors leak at fuel rail

Get some new O-rings, and this time put oil on them before you insert them into the fuel rail. The regulator is alright.The problem is that the o-rings can roll up, or twist when push em in dry. Had this problem once, easy fix, but was frustrating.

Posted on Mar 30, 2009

  • 38 Answers

SOURCE: my 96 v6 4.0 grand cherokee is reading these codes

douple ck all the ground wiresto engine,trans bell housing ,battery or frame/firewall look for any that may have separated from any pack of wires or broken off eyelets then thightnen all points,,.these grounds are very important to comp/injection controls and can cause a multi code problem like yours.

Posted on May 07, 2009

  • 6 Answers

SOURCE: no fuel at injectors in throttlebody

Check the wiring to the injectors and your fuel pump

Posted on Jun 20, 2009

  • 603 Answers

SOURCE: can bad fuel injector damage spark plugs on a 2005

Bad injectors cannot make plugs bad.
Plugs are cheap compared to injectors.
I've replaced my own plugs, so I cen't tell you the labor to replace them.
If something needs to be fixed you can bet they will charge whatever they can!

Posted on Jan 11, 2010

  • 15 Answers

SOURCE: 89 GMC K2500 5.7L TBI not spraying fuel

have you checked the coolant temp sensor? it controls air-fuel mixture.

Posted on Feb 04, 2010

  • 1796 Answers

SOURCE: 1994 toyota pickup with 22re

Hi!!

During cold engine starting, the cold start injector is used to supply additional fuel to the intake manifold to aid in initial start-up. The opening and closing of the injector is determined by the start injector time switch. When the engine coolant temperature falls below a certain point, the switch opens the cold start injector. As the engine coolant warms up, the switch will close the injector.

Your problem sounds like fuel delivery problem, let's start bychecking the following fuses

M-fuse (AM2 30A)
Fuses (EFI 15A, IGN 7.5A)
EFI main relay
Fuel pump
ECM
Wiring connections

Next step is replacing the fuel filter and checking fuel pump pressure.

Good look!! Keep me posted!!

Posted on Aug 24, 2010

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1 Answer

What are the probable causes of DTC P0302?


code p 0302 refers to cylinder 2--misfire detected===causes --engine mechanical fault--wiring---ignition/fuel system---injector--ECT/MAF sensor---ECM
check the fuel pressure in the fuel manifold ( one reason for low power and missing)
check/ replace no 2 injector
check that the wiring for no 2 injector has no moisture in any harness connections

Feb 13, 2016 | Cars & Trucks

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I have a Saab with a service code P0304 I looked into it usually bad ignition coil...I replaced the coil but No go, any ideas?


P0304 code means - Cylinder 4 Misfire detected.

Possible causes are:

- Faulty spark plug 4
- Clogged or faulty fuel injector 4
- Faulty ignition coil 4
- Fuel injector 4 harness is open or shorted
- Fuel injector 4 circuit poor electrical connection
- Ignition coil 4 harness is open or shorted
- Ignition coil 4 circuit poor electrical connection
- Insufficient cylinder 4 compression
- Incorrect fuel pressure
- Intake air leak

Jul 24, 2015 | Saab Cars & Trucks

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I have a 2005 mercury sable the. check engine light came on. I took it to AutoZone and the readings said it's running lean. Wht does that mean and what could be the cause?


It means that the engine is running lean which can cause engine knock. When the knock sensors detect excessive knock they set the check engine light.
Low fuel pressure.
Dirty fuel filter.
Dirty or bad MAF sensor.
Bad MAP sensor.
Vacuum leak.

Bad injector.

Jun 07, 2015 | 2005 Mercury Sable

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Misfiring


code p0303 refers to cyl 3 misfire detected ===causes engine mechanical fault--wiring--ignition/fuel system--injector--ECT/MAF sensor--ECM
code p0316 refers to misfire detected during start up --first 1000 revs===causes --engine mechanical fault--wiring--ignition/furl system--injector
the common fault cause is ignition/ fuel system and injectors so I would be checking fuel pressure and injector systems for clean and wiring connections are good especially on no 3 injector.

Apr 19, 2014 | Mazda 626 Cars & Trucks

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P1601 hilux code


DESCRIPTION

DTC No.DTC Detection ConditionTrouble AreaP1601When any condition below is met (1 trip detection logic):
  1. Fuel injector compensation code is not registered.
  2. Wrong injector compensation code is registered.
  3. Fuel injector pilot quantity learning value is not registered.
  1. Fuel injector compensation code
  2. Fuel injector pilot quantity learning value
  3. ECM
This is a copy of the Toyota manual for hi lux. Check for faulty injector / wiring

May 24, 2013 | Toyota Cars & Trucks

1 Answer

Po 203


P0203 - Injector Circuit Malfunction Cylinder 3
Possible causes- Fuel Injector 3 harness is open or shorted
- Fuel injector 3 circuit poor electrical connection

- Faulty fuel injector
- Faulty Engine Control Module (ECM) When is the code detected?The P0203 is set if the Engine Control Module (ECM) detects a low or high voltage drop or resistance at the number 3 engine cylinder injector.

Aug 16, 2012 | Cars & Trucks

1 Answer

WHERE CAN I FIND ERROR CODE INFO FOR P2146 PLS ?


DTC P2146

The ECM supplies high voltage to each fuel injector on the ignition voltage circuits. The ECM energizes each fuel injector by grounding the command circuit between the FICM (fuel injector control module) and the fuel injector. The FICM monitors the status of the ignition voltage circuits and the fuel injector command circuits. When a fuel injector circuit condition is detected by the FICM, all of the fuel injectors will be disabled. If a circuit condition is detected on a fuel injector circuit for cylinders 1, 2, 3, or 4, DTCs P0201, P0202, P0203, P0204 will set, along with DTC P2146. So something is wrong with your injectors or their wiring.

Apr 27, 2011 | 2007 Volkswagen Passat Sedan

1 Answer

1996 explorer 6 cyl getting a p0305 code


cylinder no. 5 misfire detected. Check the spark plug, the spark plug wire, the fuel injector, The fuel injector o-ring (if the o-ring is bad, no compression). You can swap the spark plug or wire with a good cylinder and if the problem moves over then you've found your problem. Same rule with the injector.

Feb 08, 2011 | Ford Explorer Sport Cars & Trucks

1 Answer

Trac off light came on and off then stayed on while driving, p0203p0204 p0300 codes when scanned with little machine better read open circuts in both injectors loss of power


P0203 - Injector Circuit Malfunction Cylinder 3

Powertrain Control Module (PCM) or Electronic Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The PCM/ECM will trigger the P0203 code when the resistance or voltage drop at the injector #3 is out of specifications.

Causes:
- Open or shorted wiring harness to the injector #3
- Bad injector #3
- Bad PCM/ECM

Solutions:
- If damage, repair injector wire harness or connector
- Replace injector
- Replace PCM or ECM


P0204 - Injector Circuit Malfunction Cylinder 4

Same info as the P0203 DTC


P0300 - Random/Multiple Cylinder Misfire Detected

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor (POS) signal to vary, Powertrain Control Module (PCM) or Electronic Control Module (ECM) can determine that a misfire is occurring.

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

Solutions:
- Perform Injector Service
- Replace Spark Plugs
- Replace Injectors
- Replace Ignition Coils

Feb 03, 2011 | 2001 Pontiac Sunfire

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

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