Question about 1995 Chevrolet Blazer

1 Answer

95 GMC Jimmy 4.3l W vin rough idle

Engine has 319,000 km all highway. Vehicle just up and quit while driving down hi-way. Had spark and fuel. No codes Fuel pump & spider Injector set replaced 2 years previous ran great till now. Suspected timing chain. Had healthy spark on several plug wires, checked fuel pump pressure, up to spec, minimal leakdown even after 1 hr. moved plug wires ahead 1 space on distributor cap, engine fired right up. Ah-ha timing chain. Changed that timed on #4 tdc no start. Checked all sensors everything appears good. Checked for spark again and lo and behold none. Pulled distributor cap, hold down screws for rotor had fallen out rotor in wrong position how long had it run like that with no screws holding rotor on ?? Replaced rotor, cap, new plugs boom runs great. Fast forward 2 weeks idles really rough notice a plug wire arcing on exhaust manifold replaced 2 yr old AC wires for new still same crappy idle. Compression test lowest 110 highest 135 steady vacuum 15 psi idle. replaced all suspect vacuum hoses. Forgot to mention replaced intake gaskets and intake plenum gaskets previous to latest problems. Changed out each plug 1 at a time, no change in idle performance. Driving under load and overal performance are very good. EGR appeared good, cleaned up & replaced gasket when intake gaskets were installed. 1 month previous to all these problems vehicle wouldn't idle down, changed out IAC valve then fixed vacuum leak at intake plenum to solve actual problem. Hate spening money on parts I don't need. Every thing should be good but its not, any suggestions out there?

Posted by on

  • 4 more comments 
  • chiefdavidso Dec 02, 2008

    I have a similar problem on my 94 S10 4.3 CPI vin W but mine also includes no start cold. Everything new, got 70psi fuel, got spark (intermitent). A little carb clean and starts right up.



    One of the several problems was the injector wires, I opened the harness accross the top of the valve cover and touched the wires while engine running and the engine died so I spliced in another harness.

    Jeff

  • Anonymous Mar 15, 2014

    replaced, plugs, leads, rotor, check #1 and #4 ok. #2 and #3 problem....

  • Anonymous Mar 16, 2014

    good compression 175 lbs. new spider injector system upgrade, new plugs,wires,cap,rotor. performed leak down test, cylinder holds good, no leaky valves, new computer flashed to vin. number. all wiring checked good. no shorts to ground, or open connections. checked for leaky intake gaskets, no leaks found. valves opening and closing equally on number 2,4 and 6. don't expect bad cam. also new fuel pump pressure good, approx. 64 psi. Any advice ?

  • Anonymous Mar 18, 2014

    runs great maybe idles a litte fast

  • Anonymous Mar 26, 2014

    Put in new wires plugs new timimg chain tensioner motor mounts compression check air filter checked for vacuum leaks and had car scoped not even engine lite comes on help has great pick up rechecked timing is spit on and rechecked carb is ok

  • Anonymous Mar 30, 2014

    Changed Intake gasket pulled distributor what do I need to do to get it back in time

×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.

Posted on Dec 10, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Rough idle while in park, cutting out on highway


It could be something as simple as a vacuum line,but sounds fuel related. Possible pump.get a fuel pressure reading done and if pressure doesn't hold.....suspect fuel pump

Jan 23, 2013 | Ford Escape Cars & Trucks

1 Answer

95 gmc jimmy rough idle fuel in exhaust drives


Purchase new egr valve gasket with screen on it. The motor as it get older produces more carbon it then begins to break off and when the valve opens it get caught in there. i have cleaned mine several times and finally found the gasket at napa for around 22 bucks. All you need it 10mm wrech and 10mm socket with ext. takes around 10 min to do.

Jan 10, 2010 | 1993 GMC Jimmy

1 Answer

Rough idle(rich) stalls in gear


Basically clean up before use like opening the plugs and adjusting the spark gaps, spray some carb cleaner at the intake & if The soud of the engine smoothens even slightly, then add some it to the fuel in the fuel filter & gun the engine a few time. Flush the radiator and fill in frsh coolant/water. Check the level of water in the battery and top up with distilled water. Clean the air filter and check fan belt tightness. After these small maintenace checks it should run OK.......sodeep

Aug 07, 2009 | 1993 GMC Jimmy

3 Answers

2001 GMC Jimmy Idling rough


HI
P0300 is multiple misfires.
P0171 is lean burn on left bank 1 means drivers side
02 sensor is faulty. Your vehicle is over fuelling that is why your are getting P0300 code and the rotten egg smell. Good idea is to replace both 02 sensors.

Apr 04, 2009 | 2001 GMC Jimmy

1 Answer

Engine running rough, hard starting


Try cleaning the EGR, there common to carbon build up on the 95 JImmy's.

Mar 20, 2009 | 1995 GMC Jimmy

2 Answers

HARD TO START WHEN COLD AND WHEN IT DOES IDLES BAD AND STALLS.


Try replacing the ignition control module it is located under the distributor cap Cost is around $30.

Jan 10, 2009 | 1991 GMC S-15 Jimmy

2 Answers

JUST DONT WANT TO RUN


Check the fuel pump.

Jan 09, 2009 | 1991 GMC S-15 Jimmy

1 Answer

FEELS LIKE GETTING NO GAS


cHECK THE FUEL PRESSURE AT THE RAIL. iF LOW i WOULD CHECK THE INLINE FILTER AND THEN A POSSIBLE PUMP

Jan 09, 2009 | 1991 GMC S-15 Jimmy

3 Answers

1995 GMC safari running rough


check for cracked spark plug wires might be shorting out on engine

Jan 06, 2009 | 1995 GMC Safari

Not finding what you are looking for?
Cars & Trucks Logo

2,094 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

60667 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21936 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...