These forums are free and rely upon the goodwill of members to help and assist others. Any donations will be gratefully received.
| You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are some features you can't use. Join our community! If you're already a member please log in to your account to access all of our features: |
| help with electrics i think; uncontrolled revving of engine | |
|---|---|
| Tweet Topic Started: Aug 22 2015, 08:51 PM (1,713 Views) | |
| keef700 | Aug 22 2015, 08:51 PM Post #1 |
Newbie
![]() ![]() ![]()
|
I have a fiat ducato maxi in a 2003 hymer motorhome. it has I believe an Iveco 8140 series engine. have tried fiat who really don't want to know so I am asking for any help if possible. the engine will rev up to 2000 revs with no reason, I can be stood outside the van not touching anything ticking over normally then it will rev on its own to up to 2000 revs. absolutely no idea why the sppoky thing is if I press the horn it returns to normal tickover, also found that if I raise electric window it also reverts. swith anything else on , air con, lights, blower, nothing. anyone know of this or may have a potential remedy. done this for 18 months tried all sorts new pedal etc but no difference. hope someone can help. Regards keith |
![]() |
|
| Spooky_b329 | Aug 23 2015, 06:38 AM Post #2 |
|
Administrator
![]() ![]() ![]() ![]()
|
Hi, its unlikely (due to the length of time without other issues such as flat battery) but check the battery voltage when the engine is running, the alternator is designed to put out 14.4v and if the output is low the engine will rev up to try and compensate. I'm not sure how low the voltage needs to get before this happens. Otherwise it could be an earthing issue, have the earth straps from battery to chassis and battery to engine been removed and cleaned up? A jump lead between the negative terminal and the engine block is a quick way to ensure good earth continuity so you could try this next time it revs up. I'm not that familiar with the engine codes, 2.3 or 2.8l? |
![]() |
|
| Bazil-S | Aug 23 2015, 08:20 AM Post #3 |
|
Member
![]() ![]() ![]() ![]()
|
Hi, It is indeed a matter of earth connections, as Spooky said. Perhaps EDC, horn and other loads have a common earth point, on the body I presume, instead the alternator has on the engine earth point. If on a bad connection is applied a relatively high loads, as horn or electric window, the connection will heat up forming microscopic welding points, restoring somehow the connection. Although, the connections between alternator and battery are in good condition, it is possible that the connection between the battery and EDC to be bad... most frecvent is bad earth connection. EDC is the one who reads the battery voltage (indirectly by reading its own supply voltage) and try to compensate by increasing the engine revs. P.S. 8140.XX.XX series= 2.8L F1A.XX.... series=2.3L F1C.XX.... series=3.0L |
![]() |
|
| keef700 | Aug 23 2015, 02:57 PM Post #4 |
Newbie
![]() ![]() ![]()
|
Thanks for feedback, engine is indeed 2.8 jtd. am having all earth points checked this week hopefully so will find out I hope. Just seems so weird that thing totally unrelated rectify the fault for a short time. Thanks will let you know how I get on regards keith
|
![]() |
|
| ivecofd | Aug 23 2015, 09:31 PM Post #5 |
|
Member
![]() ![]() ![]() ![]()
|
35C12 2005 MWB DRW 3rd gen’ crew cab tipper F1AE04 85.3 kw 2.3 cc 16v EDC 16. 8140XX of which there are several types 2.8 ltr. The hp varies from 88 to 141/150. 8140.43C.4 ID/TCA 2.8 ltr. 8140.63.4 PC/NA 2.8 ltr. There are engines with electronic high pressure injection system 8140.43R.43XX/44XX--------.43B.43XX/44XX --------.43S.41XX------ .43S.43XX/44XX------------.43N.43XX/44XX and: Engines with rotary mechanical injection pump 8140.43C.43 XX and 8140.63.40 XX. Looked at 8140 type engine trouble shoot for causes of high idle rpm. Check: Air intake leak. Coolant level. Coolant temp sensor. ICV if there is one. Cruise Control. Fuel temp sensor. Battery voltage low, idle is 1300rpm. Glow plug always on = short, possibly higher idle. Crankshaft rpm sensor gap. If idle at 1500 rpm possible short at accelerator pedal. Brake pedal 2 switches. Accelerator/brake - press brake and engine should idle. Clutch sensor faulty, engine can rev up. ECU idle speed memory lost. Cruise control and power take off can increase engine idle rpm. The horn button is on a stalk, ON MY VEHICLE there are two connectors just under the steering wheel. Connector P2 pin 9 is earth. Connector P1 pin 4 is live from fuse 12, and pin 5 is to the horn(s). Most of the wiring on the drivers side is bundled under the consul and goes to/from the passenger side where the fuse box is. It is likely that the wiring for the drivers side window is in this bundle. The bundle(s) go to/from the fuse box and through the engine/cab bulkhead into the engine compartment. The brake, accelerator, cruise control and other wires are in this bundle, the various bundles on Iveco's are known to fray so there could be a short in one or more of the bundles. 35C12 2005 MWB DRW 3rd gen’ crew cab tipper F1AE04 85.3 kw 2.3 cc 16v EDC 16. Edited by ivecofd, Aug 23 2015, 09:41 PM.
|
![]() |
|
| 1 user reading this topic (1 Guest and 0 Anonymous) | |
| « Previous Topic · Iveco Daily 1999-2006 (previously 3rd gen) · Next Topic » |





![]](http://z6.ifrm.com/static/1/pip_r.png)



Earth_points.jpg (34.7 KB)