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Misfire on tector 75e17 engine

HI , I Have a tector engine in an iveco 2001 75E17. On driving home the other night the engine went down from 4 cylinders to 3 and now sounds like it is running on two, so it is hard to start but does start. i have put new fuel filters on and basically the common rail appears to be full of diesel and under pressure. Cylinders one and four appear to be firing, but no diesel appears to be coming out of the valves on two and three (these are the valves that fit between the common rail and the injector feed pipes that go to the tubes) when we had it running the other day on two cylinders, we actually took the two feed pipes off and it made no difference at all, it carried on running and no diesel came out of either, there is def not blockage in the common rail as we have stripped it and checked it. But if we swap the valves from cylinders one and four to two and three the problem remains on cylinders two and three ! does anyone know what these little valves do ? when i take them out i can just about blow through them (50 and asthmatic!) and yet the diesel doesnt seem to come through them at all !! any help would be greatly received, it is stumping us...... thanks pete

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Posted on Jan 02, 2017

  • 1010 Answers

SOURCE: Fuel injector

Higher octane is not going to help, it's only for high compression engines to prevent pre-ignition (knock). You should try a tune up. New fuel filter, air filter spark plugs and wires, pcv valve and a bottle of good fuel injector cleaner that you add first to gas tank then fill up with gas (Techron is a good option for this). The only situation where higher octane would help with an engine not requiring it is if there is heavy carbon buildup in the cylinders causing pre-ignition and even than it's a temporary fix until they can be properly cleaned.

Posted on Jul 01, 2008

  • 104 Answers

SOURCE: 1991 XJ6 cylinders 5/6 not firing

Check for spark at the cylinders you mention. Unplug the wires from the spark plugs, put a spark plug in the end of the wires, and attach the body of the plugs to earth, or an exposed metal part of the engine. With the engine running, you should have spark at the plugs. If no spark, get the ignition system tested. If there is spark present, and you think the fuel is ok, then the compression must be at fault. The things that are required for combustion are: spark, fuel, and compression. Get a compression test done on the engine, but first check for any vacuum leaks in the inlet manifold around the cyl 5 and 6 area.

Posted on Oct 26, 2008

  • 5158 Answers

SOURCE: Eratic idling and misfiring under pressure

confirm that the fuel pump delivers the proper pressure to the injectors

Posted on Mar 08, 2009

  • 166 Answers

SOURCE: 99 explorer running rich check engine light wont come on

coolent temp sensor to pcm . the truck thinks it cold and its riching the fuel mixture . its a cheap part . i would have a good shop with a good scaner check it fist but thats up to you

Posted on Jun 12, 2009

SOURCE: Have a 1999 Toyota Tacoma with a 3.4. Vehiclw was

Most likely I a would suspect the fuel rail had moisture in it. If you checked emissions it would most likely show no HC and alot of 02 and no CO. If it does show alot of HC then I would suspect sticking valves intermittantly . The pinging really points to no fuel issue tho. If you pull the injector connector off and no change then I would remove the fuel rail and inspect. Also make sure the wires are in the correct locations. It easy to get them wrong.

Posted on Sep 03, 2009

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