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DISCUSSION FORUMS : Forkliftaction.communicate
Forum: Mechanical Troubleshooting
Brand: Caterpillar - Model: C5000
Number of messages: 6

START MESSAGE:
RonChap
Ohio, United States
Engine will fire once then not for two or three revolutions then fire once again . It had a E27 Pos error code that was addressed . Changed plugs , coils, . Then changed the crank and cam sensors as well as the small harness to them.He ran diagnostics and checked all pressures sensors and all seemed good.  After he switched ecus and other components from another running machine he thought it needed a complete harness. That was replaced and the problem is still there. It has no codes  and when you try to start it fires once then cranks three more times then it will fire once. It fires at a regular rate but will not fire between the three revolution interval.

Posted 9 Jun 2015 08:13 AM Reply  Report this message
REPLIES: Sort replies by
mrfixit
New York, United States

Are you sure it's problem is it stops sparking? Could it be a fuel or bad compression problem?

Posted 9 Jun 2015 08:30 AM Reply  Report this message
RonChap
Ohio, United States
had a cat guy come and run his diagnosis on it and he said all the fuel pressures are right  and that's when he changed the main wire harness.  . he did switch the vaporizer to no avail. did not check the compression as the truck ran well before this event but will check tomorrow. pretty sure it stops sparking . when you hook up a spark detector  it mirrors the way that it fires then stops.  Is there an auxiliary shutdown function on the ecu? could it be a mechanical malfunction in the timing system? I did take the rocker cover off and checked that the valves were opening and closing all the way. my cat guy seems to have given up so any thoughts would be great.

Posted 9 Jun 2015 09:23 AM Reply  Report this message
mrfixit
New York, United States

You need to do some very basic tests instead of replacing thousands of dollars worth of parts. Test to see if it is spark, fuel, or mechanical. Take the spark plugs out and lay them on the head all hooked up to the coils. Turn the key to start and watch what happens. Are they all sparking and continue to spark? If yes, then then I would head for the throttle body. Take the air intake off and look in there and turn the key on. Do you hear it work and see it move? If not, then that may be the problem. If it's not sparking, check to see if there is voltage across the black and red wires on the coils. If not, then check the ignition 1 relay to see if it's turning on. You have to pinpoint what system the problem is in.

Posted 9 Jun 2015 08:31 PM Reply  Report this message
RonChap
Ohio, United States
I as well as the cat mechanic have performed all of these procedures and more. As I stated before all plugs fire a few times then shut off for a few revolutions then fire again at a regular pattern. The throttle body seems to work well and the voltages and pressures all seem to be in order. He has swapped out from a running machine what seems like all pertinent parts, ie. ecu, the coil driver box, coils ect. He stated to me that the coil driver box will not send the signal to fire the coils if it does not see fuel but couldn't tell me what sensor it reads that information from.

Posted 10 Jun 2015 05:44 AM Reply  Report this message
alain_prost
West Midlands, United Kingdom
Could it be a faulty cam or crank sensor breaking down causing it to cut spark intermittently? Or is there teeth missing on ring gear and the crank sensor not seeing the teeth so cutting the spark?

Posted 18 Mar 2018 07:04 AM Reply  Report this message


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