Question about 2000 GMC Sonoma Extended Cab

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Missing really bad it was a multi cylender missfire so i replaced the spider injectors and metering box to the new system and its now missing really bad

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  • eth_beak Sep 10, 2009

    yes 80 psi

  • eth_beak Sep 10, 2009

    yes it is now cylender 2 miss fire and i replaced the
    spark plugs and wire cap rotor

  • Mike Butler
    Mike Butler May 11, 2010

    Have you checked fuel pressure?

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  • Master
  • 1,280 Answers

Hmmmm.. You should have had it PROPERLY diagnosed!... Seems now that is what you should do now.

Posted on Sep 10, 2009

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2 Answers

What could this be?


CODE 301 IS #1 MISSFIRE 300 IS RANDOM MISS FIRE 201 IS INJECTOR FAULT . I WOULD START BY SWAPPING # 1 INJECTOR WITH SAY # 3 AND SEE IF THE MISSFIRE MOVES TO #3 IF SO REPLACE INJECTOR, IF NOT THERE COULD BE WIREING ISSUES

Oct 16, 2013 | 2006 Jeep Liberty

1 Answer

1998 ranger 2.5 manual enging miss


ck for leak at intake. if no leak pcm/ecm may be sending fire command to slow to # 1 . the fuel injector is always hot the ecm sends a ground to the injector. even new parts can be bad ck inj, with ohm meter resistance should be the same between each inj. im not sure of the specifications but they should read the same my jimmy specs are 1.9-2.1 any other reading is bad . no resistance or lower or higher readings my injector would be bad. 140 is good reading, timing can be off a little and still run but rough like a miss. a code wont set most misfires will set a dtc or flash the engine light to let you know damage to cat system is happening , to much fuel a system rich,to little a lean. a bad mass airflow meter can also cause a misfiring or rough idle ck with scanner if dirty clean with brake cleaner first before replacing . hope this helps some let me know how it goes.

Jul 15, 2012 | Ford Ranger Cars & Trucks

1 Answer

Coil for #1 and #4 is dead


if the rough idle stays on those cylenders check plugs for wetness check coil plugs fore bad connections or broken wires check injectors and injector plugs

Apr 01, 2012 | 2003 Chevrolet Impala

1 Answer

2005 5.3 1500 pickup multi cylinder misfar replaced intake gasket,coil,injector,and plug in cylinder 1&3 number 1 is missing the most also replaced oxygen sencer bank 1


Just so I learn something

Spark plugs -wear ,seldom misfire

Injectors and Coils-need to be component
tested,before I would replace

Testing-- is using a meter,oscilloscope,etc.

Same on O2 Sensor,scope is only way to
see switching time.

I would suggest something common to
multi cyl misfires.
Because you get a code for #1,doesn't mean
that coil is bad. You may have to walk a new
coil from one cyl to the next.

CPS Sensor ?
Is there a cam sensor on that engine?

Feb 09, 2011 | 2005 Chevrolet Silverado

2 Answers

We have a 2000 Windstar with about 145K miles that in the last 2000 miles has begun to misfire badly and ping under load. Hi octane gas calms most of the pinging, but does nothing for the misfire. No...


Some Ford engines are not equipped with knock sensors. Yours may be one of them. Located in the wiring loom, close to the ECM, is a "jumper" that when removed retards the timing 4 degrees. This should correct your pinging problem. as for the missfire try changing the plugs and wires .also check the egr valve. thanks

Oct 26, 2010 | 2000 Ford Windstar

2 Answers

My 99 volkswagon pssat has a missfire in the number two cylender. i changed the spark plug and coil pack. the code is still there when i took it back to be scanned?


Did you have it cleared after you replaced parts? if not it may take 50 ignition cycles to clear it out. but if you feel it missing still you may have a sticky injector.

Oct 22, 2010 | 1999 Volkswagen Passat

2 Answers

Have a 97 Blazer. It started to miss fire so I gave a tune up cap,rotor,wires,plugs and fuel filter.It still had a missfire so I took it to a shop and they said I had a bad injector. I replaced the spider...


Check the compression on that cylinder,and the valve springs on that cylinder,it is most likely that problem,or,a crack in the intake,on number two,They will crack under the intake on that cylinder in the oil valley.If this was at all helpful,please rate,and thank you.

Jul 18, 2010 | 1997 Chevrolet Blazer

3 Answers

05 Impala missfire code 301 have changed


check intake for vaccum leaks,the gasket also and egr valve, thats alot of parts to have replaced without diagnosing first, if there are no fuel leaks and you said all injectors were replaced then you have a defective fuel pump, also these engines had misfire problem because of dirty injector but you replaced them so count that out. good luck.

Nov 02, 2009 | 2003 Chevrolet Impala

3 Answers

Know if my 95 chevy blazer has a spider CPI?


A spider injector is located underneath the intake plenum and this is multi-port. Otherwise you have a throttle body injector system. Vortec engines have spider injectors and they are super expensive to replace ($400.00- 850.00) each ! There is only one spider injector for each engine it has 6 legs/fuel tubes that go to each cylinder.

Oct 10, 2009 | 1995 Chevrolet Blazer

1 Answer

No fire on passenger side new spider injectors new tuneup


I suspect that your CPFI unit has plugged injectors,the CPFI is Central Port Fuel Injection and is located inside the upper intake manifold,we call it a turantula because it looks like a spider,it houses the injectors or what is called poppets on this sys,they have problems with becoming plugged with carbon and causing a missfire,you can attempt to clean them but that usually does not work and is best to have it replaced,it is an expensive unit and GM has updated to a better system for replacment. I've also know of a few fire in the manifold that messed up the poppets. 
Check the wireing harness to the injector first, may have gone lose, and try to get it scaned. Could be something simple.
Good luck and hope this helps.

Apr 03, 2009 | 1994 Chevrolet S-10 Blazer

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