Question about 1999 GMC Jimmy

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99 gmc put new intake gasket on now i have a p0300 & a p0301 changed plug and wire good compression fuel pressure is 60 psi no leaks sometimes a p0302 will come up as well please help thanks

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  • GMC Master
  • 1,250 Answers

When you change spark plug did you check the spark plug gap
and how old O2 sensors
then you need to know that misfire are calculated with crankshaft sensor data.
you could do a clean with combustion chamber cleaner

Posted on Oct 17, 2013

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Posted on Jan 02, 2017

  • 58 Answers

SOURCE: no power when hit the gas

The fuel presure should be at least 60- 66 psi key on engine off, and then drop some when started, if it doesn't go any higher than 50 psi that would explain your backfire concern. If it is low then the fuel pump is weak. I have also seen soot on the little wires inside the Mass Airflow Sensor cause a concern like this.

Posted on Nov 18, 2008

  • 9 Answers

SOURCE: 99 gmc no power when passing or climbing

It could be electric fuel pump stall. The pump isn't pumping fuel fast enough. This model may have a inline fuel filter before the fuel pump as well that might need replacing.

Posted on Dec 02, 2008

  • 132 Answers

SOURCE: 99 gmc no power when passing or climbing

It could be the cat. it sounds like this could be your problem

Posted on Feb 07, 2009

  • 3600 Answers

SOURCE: GMC JIMMY NO START BUT GOT SPARK AND FUEL

try the oil pressure switch, that was a common problem on Gm trucks when I used to work on them, the oils switch was bad and woulden't allow it to start and the ones I worked on were on the back of the distributor.

Posted on May 29, 2009

dennymulford
  • 1055 Answers

SOURCE: 1998 GMC Sierra- runs rough then stalls when

had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!

Posted on Jun 06, 2009

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2 Answers

99 rx 300 I have trouble codes p0300, p0301, p0303, p0305, po172, and p0171.Stomped


codes p 0300 through refer to misfires on each cylinder with the end number ( 301 is no 1 cylinder , 302 is no 2 cylinder ans so on)=== causes --engine mechanical fault , ---wiring---ignition/ fuel ---injector/s---ECT/ MAF sensor/s ---ECM
most misfires are from injector faults like dirty/blocked tips, low fuel pressure , no pulse or problem pulse from ECM rather than plugs and wires and coils
codes p0171 refers to system to lean bank 1===causes ---intake exhaust leak---air system---maf/vaf sensors ---fuel pressure / pump---injectors ---heated oxygen sensor ( HO2S)
code p 0172 is system to rich-====causes ---intake blocked ---EVAP cannister purge valve ---fuel pressure --EGR system---injector/s ---HO2S
couple these two codes with the misfire codes , I suggest you look at the injectors, fuel pressure (too low) from EVAP problem not venting tank, fuel pressure regulator, EGR system

Aug 17, 2016 | Cars & Trucks

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What are the probable causes of DTCs P0300, P0301, an P1189?


P1189 Buick - Engine Oil Pressure Switch Fault PO301
Possible causes
- Faulty spark plug 1
- Clogged or faulty fuel injector 1
- Faulty ignition coil 1
- Fuel injector 1 harness is open or shorted
- Fuel injector 1 circuit poor electrical connection
- Ignition coil 1 harness is open or shorted
- Ignition coil 1 circuit poor electrical connection
- Insufficient cylinder 1 compression
- Incorrect fuel pressure
- Intake air leak
PO300 is just telling you that you had a misfire.


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2 Answers

Getting trouble code p0301


Code 301 means cylinder one is not producing power.
Problem could be ignition, fuel, or mechanical.
If compression is good on all cylinders, check the fuel injector.

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P0300 code


sounds like you have checked a lot of things if it was mine I would do new intake gaskets, I had a 2002 Sonoma I did a lot of what you did and every time I gave it back to owner a few days later lite was on and p0300 I did intake gaskets and its been good 2 yrs now,not sure what gaskets you got but gm use plastic ones I got new gm ones and they were aluminum type call gm dealer parts good luck

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Looking to buy my frinds 2002 Chevy Silverado. It has a 5.3 and getting P0300 codes. It is very hard to start, you have to cycle the key many times to get fuel for it to start. After may attemps, it will...


"All cylinders have 120 psi compression." I would be seriously concerned about this. Typically, an engine's compression should be much higher e.g. 180 psi or more. Could mud have gotten into the exhaust system causing restrictive back pressure?

Oct 24, 2013 | 2002 Chevrolet Silverado 1500

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What is the normal fuel pressure for a 2002 grand am v6?


Definition of Diagnostic Trouble Code P0300 Category: Powertrain Definition: Random/Multiple Cylinder Misfire Detected

Apr 22, 2017 | 2002 Pontiac Grand Am

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I have a 2002 GMC Sierra 1500. 4.3 liter engine. I brought it to autozone and they put the gauge on it and got two codes P0140 and P0300. I had my distributor cap replaced, ignition rotor, plugs ,wires,...


Clean mass air flow sensor with a nonchlronated brake cleaner,install new air filter and check all vacuum lines for leaks then check for vacuum leak around or at intake manifold.Code P0140 is for mass air flow sensor code P0300 is a multiple misfire which more than likely is a vacuum leak possibly intake manifold gaskets leaking.

Apr 11, 2011 | 2002 GMC Sierra 1500

2 Answers

I'm getting P0300,P0301,P0304,P0308,P0316,P0355.. Why am I getting so many misfires?? spark plugs look fairly new and there are 4 new coils on cylinders2,3,5,6.... What steps should i take?? will fuel...


So your codes are: Multiple random plus misfires on 1,4,8. Misfire during startup, and ignition coil E (cyl 5) primary or secondary circuit malfunction.

You said that four new coils were installed. Perhaps the coil to spark plug order and the firing order have been scrambled. The spark plug wires may be old and leaky--especially if they are the originals from 2003. You could have a vacuum leak into the intake manifold, the EGR valve could be sticking open when it should be closed, the fuel filter could be clogged, the fuel pump pressure could be too low or stuck at the idle setting, the fuel injectors could be dirty, and cylinder compression could be low (putting on the wrong size o-rings when reinstalling injectors will prevent proper compression.)

Feb 10, 2011 | 2003 Lincoln LS

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

I have a 2000 gmc sierra 5.3 with a number 6 cylinder missfire. things i have done so far: 1. compression test on number 6 tested fine,as well as the rest of the cylinders 2. leak down test. Held...


I would check the valves for number 6. If one or both are burned, stuck or out of adjustment it would cause your problem. If a cam lobe for that cylinder is burned or badly worn it could be the culprit.

Jan 10, 2010 | 2000 GMC New Sierra 1500

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