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1996 Chevy S10 4.3 problem. Started surging at highway speeds and had code po300. Searched forums and found distributor has issues. Replaced distributor, module, cap, rotor and it seemed ok for a day.

Started surging at highway speeds and had code po300. Searched forums and found distributor has issues. Replaced distributor, module, cap, rotor and it seemed ok for a day. Started surging again and same code. Replaced plug wires with AC Delco, ran worse immediatally and gave code p1345. Recheckked timing, seemed good, ******** one tooth and code p1345 went away and ran pretty good. Drove for about 30 miles and it really started surging, po300 came back. Went to parts store to get injector cleaner, added to a full tank of premium, drove about 5 miles and surging got so bad, truck wouldnt go over 20 mph and it started popping a lot through the exhaust. Barely made it home. Ran to the parts store again and bought a crank sensor, and problem remains! HELP!!! I am loosing my mind! TPS Sensor tests good also. Code p1345 and po300 back on and it wont even idle, pops and stalls.

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Posted on Jan 02, 2017

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SOURCE: GMC Sierra 2002 4.3 V6 P1345

intake gasket i had the same problem with my truck

Posted on Mar 09, 2009

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SOURCE: 02 GMC Sierra 4.3 V6 P1345

Well that sounds like a tough one , But here is a site worth checking out . Several mechanics use this it to help out people like your self that are frustrated and are getting P #$%$# off ! Good luck

http://www.obd-codes.com/forums/search.php?search_id=active_topics

Posted on Mar 09, 2009

roniecon
  • 6826 Answers

SOURCE: 1988 Ford ranger 2.9 standard

Change the stater in the distributor(hall effect).

Posted on Jan 05, 2010

Rickygittins
  • 715 Answers

SOURCE: i have an 89 ford bronco 2 with a 2.9 liter it sat

check the spark plug wires are attached all the way till it snaps, pull each spark plugs, any black deposits on any plug means it isn't firing(faulty plug,or wire) last of all take off each injector wire and notice if there is a change in idle speed (plugged injector)

Posted on Apr 27, 2010

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P0300 misfire code


Ignition Module
Vacuum Leaks
Egr
Valve issues
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Then about 10 more possibles

Being 1996 was the first year for OBD 2 Systems
You have at least some scan tool data IF you have a professional
scan tool

You have all YOU will ever need on the internet IF you know how to
ask the right questions

You can spend a lifetime looking at,printing & studying anything
about any subject

I suggest you first study OBD 2 Systems
Then the individual Components
Then get to how to test for cylinder misfires

To find out about codes

TYPE: OBD & the code ---- that easy

OBD PO300 (never need help again)

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I have had my 2003 chevy astro van at a local midas for weeks now with the following issue. when i am driving over 55mph and goto pass on a slight hill the check engine light starts flashing and will stay...


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Read this from the Jeep owners forum I visit for this type of problem. The sensors referred to are the crank and cam position sensors.
Tripdagoat just posted about his fix..
From the forum: Engine 4.0L
Had a CEL for as long as i've owned my 4.0L ZJ. i was getting code P1391. driving me crazy trying to clear it. replaced both sensors. back probed the entire wiring harness. replaced the entire ignition system. Nothing. So after some advice from a seasoned Jeepicon1.png mech, i replaced the entire distributor. apparently they are prone to wear that is enough to cause the code. It was super easy to do which was nice since i did it in the autozone parking lot to avoid the 75 dollar core charge. the distributor only runs 50 bucks. You will need a phillips head screwdriver to remove the distributor cap and a 1/2" wrench to get the distributor off. Just make sure you pay attention to how the old one comes out and be sure to put the new one in the same way. Long story short, the CEL is finally gone!!! I had searched and searched for the answer to this problem, and from what i can tell NO ONE has tried this to correct the issue. If this works for you, please pass it on to all jeep owners that may have this problem. This would have potential to be a very expensive repair if going at it with no ideas.
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1 Answer

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I have a 2000 chevy s10 ZR2 4.3L V6. I had just replaced the intake manifold gasket. I went to start it up and have now developed a misfire in cyl 5. I have already put in new plugs and wires. I...


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