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Can someone tell me where the fuel sensors r located on the 4.3 engine...1995 blazer?

Runs too rich....keeps fouling 3 of my spark plugs on one side....u can actually smell it

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  • vincent g battaglia Feb 26, 2012

    two thums up to you guys....great advice......my car is ok now....ty so much

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  • 7 Answers

It in the computer. there is no manual adjustment for the fuel mixture on a fuel injected engine. It all runs on the computer. there is a fuel pressure regulater on the fuel rail where it goes into the injectors, and it will have a small vacum line on it .. it will be a small quarter to half dollar size round thing with the vacum line coming from it and will have two small bolts or screws holding it on. But I think you will have more problems then that.. visit your local garage for a diagnostics test/.

Posted on Feb 20, 2012

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Posted on Jan 02, 2017

polarcycle
  • 1392 Answers

SOURCE: fouling spark plugs with black coating not oil

I am assuming the mitsubishi 2.5? Most likely it is an oxegyn sensor problem. If they are not reading like they should, it just floods out the car. Could also have a stuck open injector (stays on all the time).

Posted on Mar 11, 2009

  • 4 Answers

SOURCE: abs light still on after replacing sensor per scan 1995 blazer

Remove negative battery cable for a couple of minutes to reset computer if you haven't already.

Posted on May 21, 2009

  • 407 Answers

SOURCE: My 93 chevy 1500 4.3 is pouring to much fuel, I

were the injectors replace? 4.3l engines are know for messed up distributors

Posted on Oct 15, 2009

  • 2 Answers

SOURCE: I HAVE A 1993 CHEVY S10 BLAZER RUNS GREAT BUT NOW

I pretty much had this same problem what your problem is going to be is more than likely you have a pin hole leek in one of the fuel lines inside the plenum .

Posted on Jan 11, 2010

  • 1 Answer

SOURCE: Runs Fuel rich-miledge is down 50%, exhaust smells rich

Had similiar problem in my 93 buick limited. Changed cadilitic converter - no help. Replaced ignition coil (very easy) and car runs like a top again. It takes 3 coils - replace one of the 3 until you solve the problem.

Posted on Mar 22, 2010

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My s10 4cyl. i checked the relays ok could the surge be caused by the ignition?


Someone was having fun with you I think, You should have a scan tool hooked up , check the map sensor , O2 sensors . coolant temp. fuel pressure .I don't know what year your S-10 is but , this will work for any year !
1999 Chevrolet S10 Pickup - 2WD ' Blazer, Bravada, Envoy, Jimmy, S10 Pickup, Sonoma (VIN S/T) Service Manual ' Engine ' Engine Controls - 2.2L ' Diagnostic Information and Procedures ' Document ID: 320398
--------------------------------------------------------------------------------
Surges/Chuggles
Surges/Chuggles Checks
Action

DEFINITION: Engine power variation under steady throttle or cruise. Feels like the vehicle speeds up and slows down with no change in the accelerator pedal.

Preliminary
• Refer to the Powertrain On Board Diagnostic (OBD) System Check .
• Refer to Symptoms .
• Search for service bulletins.
• Be sure the driver understands the transmission torque converter clutch, and the A/C compressor operation as explained in the owners manual. Inform the customer how the TCC and the A/C clutch operates.
• Check the PCM grounds for being clean, tight and in their proper location.

Sensor/System
• Check the Oxygen sensor (O2S 1) and the Heated Oxygen Sensor (HO2S 2). The O2S 1 and HO2S 2 should respond quickly to different throttle positions. If not, check the O2S 1 and the HO2S 2 for silicon or other contaminants from fuel or the use of improper RTV sealant. The sensors may have a white powdery coating. Silicon contamination causes a high but false O2S 1 and HO2S 2 signal voltage (rich exhaust indication). The PCM will reduce the amount of fuel delivered to the engine, causing a severe driveability problem. Refer to Oxygen sensor and the Heated Oxygen Sensor in the Information Sensors/Switches Description .
• Check for proper operation of the MAP sensor.
• Check for proper operation of the TP sensor.
• Check for proper operation of the ECT sensor.

Fuel System
• Check the fuel pressure. Refer to Fuel System Diagnosis .
• Check for contaminated fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
• Check the fuel filter for being plugged or restricted.
• Ensure each injector harness is connected to the correct injector/cylinder. Refer to Engine Controls Schematics .
• Check items which can cause an engine to run rich (long term fuel trim is significantly in the negative range). Refer to Diagnostic Aids for DTC P0172 Fuel Trim System Rich .
• Check items that can cause an engine to run lean (long term fuel trim is significantly in the positive range). Refer to Diagnostic Aids for DTC P0171 Fuel Trim System Lean .

Ignition System
• Check for proper ignition voltage output with spark tester J 26792 or equivalent.
• Check the spark plugs for the following conditions:
- Check for wet or fuel fouled spark plugs.
- Check for cracks on the spark plugs.
- Check for wear.
- Check for improper spark plug gap.
- Check for burned electrodes or heavy deposits.
• If the spark plugs are fuel or oil fouled, the cause of the fouling must be determined before replacing the spark plugs.
• Check the Ignition Control Module (ICM) for proper ground connection.
• Check the ignition coils for cracks or carbon tracking.
• Check the spark plug wires forproper resistance and condition.

Additional Checks
• Check for proper operation of the TCC. Refer to Torque Converter Diagnosis in Automatic Transmission 4L60-E.
• Check the exhaust system for a possible restriction:
- Inspect the exhaust system for damaged or for possible collapsed pipes.
- Inspect the muffler for heat distress or for possible internal failure.
- Check for possible plugged three-way catalytic converter. Refer to Restricted Exhaust System Check or Exhaust System Inspection in Engine Exhaust.
• Check the vacuum lines for kinks or leaks.
• Check the generator output voltage. Repair the generator if the output voltage is less than 11 volts or more than 16 volts.
• If all procedures have been completed and no malfunctions have not been found, review and inspect the following items:
- Visually and physically inspect all electrical connections within the suspected circuit and/or systems.
- Check scan tool data.
This is information for the professional TEAHNICIAN That has a capably scan tool ! If your not familiar with OBD2 an electronic fuel injection systems I suggest very strongly that you take it to a certified technician !
This

Sep 08, 2015 | Cars & Trucks

2 Answers

Have a 89 jeep with a 2.5 liter, keeps fouling out the plugs.


How is your o2 sensor? if it is bad it would make the car run rich and foul the plugs.

Aug 09, 2015 | Jeep Cars & Trucks

1 Answer

I have a 1991 K-Blazer that we rebuilt a high output jasper engine for that came out of a 1984 Caprice, it keeps fouling the plugs after only running for a short while


EGR valve sticking or bad vacuum leak, might be a place to start. I presume the ECM, control module are functioning properly?

Apr 21, 2014 | 1991 Chevrolet S-10 Blazer

1 Answer

Sputtering and stalling while driving and then just dies.


additive? for what reason, for stalling? or just for fun added.
you didnt say.?????
if it was for bad running, did you read the container, ?
and add the correct amount on a full tank of fuel, if not , then you may have added too much, some additives are very bad,
next time use Techron fuel additive, (if you feel compelled)
if the car runs bad no fresh fuel, and all 4 sparks are fouled.
no additive is best. fouled sparks are from other reasons.
50 reasons. and not one is cured by magic in a bottle.
I run Chevron fuel in my car, so adding more benzene is of no help
ever.
you said plugs, that to me means, (????)_all 4 are fouled.
4 plugs changed, where they spec type spark plugs, J plugs.
and were the gapped to Geo Storm spec.
if new plugs foul? that means (all 4?) means its running rich.
top reason for rich are:
1: thermostat missing or stuck open (engine never reaches normal temp)
2: Sensors reading wrong,
The Check engine lamp, what does it do.?
Is CEL light glowing key on,. then out after starting, (no? then pull the DTC codes and read the problem)
too high fuel pressure, ask your mech to measure that. or DIY.
ECU stuck in limphome mode. check DTC codes for reason.
Dead , bad or weak sensors.
leaking injectors
Ask any ASE mechanic, to just diagnose the problem.
then you have your answer. but many shops never seen a GEO ever
and have no documentation. on these.
how ever alldata dot com has it.

Feb 15, 2013 | 1993 Geo Storm

1 Answer

95 GMC 5.7l keeps fouling plugs


Hi Dale,

Several factors can contribute to spark plug fouling:

- The air/fuel ratio may be too rich as a result of incorrect carburetor adjustment or a poorly performing fuel injection system.
- Worn piston rings or valve seals may allow too much oil to leak into the combustion chamber, leading to oil fouling.
- The ignition system may not be performing properly.
- Prolonged idling or continuous low-speed driving may keep the spark plug from reaching its optimum operating temperature. Using too cold a spark plug can lead to the same problem.
- A dirty air cleaner can create a too-rich condition which can lead to fouling.

Have each of the above checked and corrected.

Fuel, oil and carbon fouling can all be the result of different causes but, once a spark plug is fouled, it will not provide adequate voltage to the firing tip and that cylinder will not fire properly.

In many cases, the spark plug cannot be cleaned sufficiently to restore normal operation. Hence, I always recommend that a plug be replace, once it becomes fouled.

Cheers,

Scott


"If this has helped you in any way, please be kind enough to rate this solution"

Nov 02, 2011 | 1995 Chevrolet K1500

1 Answer

98 gm blazer has black soot from muffler giving code insufficiant switching o2 sensor bank 1 and 2 any ideas ?


Your Jimmy is running rich, air fuel ratio is not correct. Start with cleaning your MAF sensor, a dirty MAF sensor will cause your engine to run rich or lean, other causes would be a faulty fuel pressure regulator. Start with the simple and to common and try cleaning your MAF sensor, you can pick up a can of MAF sensor cleaner at most auto parts store like Auto Zone or Part Source.
Also make sure your engine is running at the proper operation temperature 190", cold running engine will cause the ECM to run your engine rich. Causing the back soot and fouling up your spark plugs and intake ports with carbon.
The ECM was programed to recognize the 4.3 vortec to run at 190" and anything cooler will cause it to run rich and poor on economy.
Thank you for using fixya and good luck.

Apr 27, 2010 | 1998 GMC Jimmy

1 Answer

2002 blazer crank but wont start


2 things that you have to check on no starts every time. Spark at spark plug and fuel. Turn key to run position and listen at gas tank for fuel pump to run you should hear a whining noise. This will only happen for 3 to 4 seconds then it will shut off until engine starts. You can turn key off then to run every 3 to 4 to listen for fuel pump. You may hear the relay click off in engine area even if pump does not run. Fuel pump failure is pretty common. If pump is running pull spark plug out or put a spare plug into spark plug wire and have someone crank engine set plug on engine and watch for spark. This will give you a starting point. Hope it helps.

Mar 30, 2010 | 2002 Chevrolet Blazer

1 Answer

My sparkplug keeps getting black, then the car begins to sputter


Car is running rich, can be a bad fuel pressure regulator or bad MAP sensor and can even be as simple as a bad vacuum hose that is disconnected. Regardless your engine is running rich (too much gas in to the engine from the fuel injectors) causing your plugs to turn black and foul, which is also causing your engine to sputter.
Start with the simple and check all your vacuum hoses, fuel pressure regulator and MAP sensor.
Good luck and keep me posted, be glad to help you get your car running 100% again soon.
Thank you for using Fixya

Mar 17, 2010 | 1995 Toyota Tercel

2 Answers

My honda civic lost power and there is oil on the spark plugs what is the proble and how do i fix it


If your plugs are oil fouled, then either the spark is weak and not firing correctly in each cylinder (you would probably have misfire) Or the 02 sensors are bad and the engine is running really rich.

Oct 16, 2009 | 1995 Honda Civic

1 Answer

1999 vw jetta 2.0


Sounds like two problems. P0300 and P0303 are possibly spark plugs. They could be a coil pack but I'm leaning toward a spark plug problem because of the other two codes - they're indicating O2 sensor problems. If the O2 sensors are screwed up, the car reverts to preprogrammed, rich fuel maps that send excessive fuel through the engine. The reasoning is, if the ECU can't trust the O2 sensors to determine how much fuel to burn optimally, it'll pump a bunch of extra fuel through the engine to keep it safe. Having too little fuel (aka running lean) can destroy an engine, so the ECU plays it safe and runs rich (too much fuel) instead. The consequences of rich running are relatively minor compared to lean running, but can and do tend to create excessive carbon buildup on the catalytic converter and O2 sensors, as well as fouling spark plugs.

First thing to do though is to swap the wires on your coil packs and see if you end up with a misfire code for the same cylinder #3. If you do, then it's the plug or wire. If it moves, it's the coilpack. Replace whichever part is faulty. You'll probably need oxygen sensors too, before you can clear all the codes.

Aug 27, 2008 | 1999 Volkswagen Jetta

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