Injector interference

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Injector interference
Topic Started: 20 Apr 2012 - 23:02 (344 Views)
NightRunner	20 Apr 2012 - 23:02 Post #1
26 Charlie Tango 609 Posts: 33 Group: Member Member #1,648 Joined: 27-Aug 2011 MANDATORY_Country England MANDATORY_Location Shrewsbury MANDATORY_FirstName Richard	Hi Folks, I am hoping someone can help with a noise interference problem my mate has from his injectors. He has a crackling sound coming through on receive that we have identified as the injectors, only does it when his foot is on the throttle, as soon as he takes his foot off it stops completely. We have so far completely re wired the rig ensuring the power cable is routed away from the engine and loom, changed the mag mount, changed the radio itself And nothing seems to improve it at all, have also tried a choke on the power cable.And locating the radio in a different place. The vehicle is a 56 reg fiat doblo 1.9 multijet diesel. The rig is wired direct to the battery, with a stinger on a mag mount . Any clues would be appreciated as we seem to be throwing money at it and getting nowhere The strange thing is we have two more very similar vehicles and have no trouble with them at all Cheers



BigTone	21 Apr 2012 - 00:38 Post #2
26 Charlie Tango 4498 Posts: 464 Group: MemberA Member #1,384 Joined: 23-Jun 2011 MANDATORY_Country England MANDATORY_Location Lincoln MANDATORY_FirstName Tony	I've had a look around for the thread blowed if I can find it, someone on here put ferrite rings on the leads to the injectors.



UKSniper1	21 Apr 2012 - 01:56 Post #3
Posts: 191 Group: MemberA Member #493 Joined: 13-Sep 2010 MANDATORY_Country Scotland MANDATORY_Location Scottish Borders MANDATORY_FirstName Wayne	hi,,i had a similar problem with my cobra and me 3.9 efi v8 rangerover,,it was fine untill i gave her some right foot and it was 30+ of crackle,,,i got around it by wiring it to the fuse box(instead of battery),,and fitting a cheap alternator sound suppressor box from halfords(£6)..and now its perfect ..hope this helps. atb..wayne. Edited by UKSniper1, 21 Apr 2012 - 01:57.



Cherokee	21 Apr 2012 - 10:58 Post #4
Da Injun Posts: 12,976 Group: Admin Member #6 Joined: 24-Jun 2009 MANDATORY_Country Wales MANDATORY_Location The Vale of Glamorgan MANDATORY_FirstName Steve	BigTone 21 Apr 2012 - 00:38 I've had a look around for the thread blowed if I can find it, someone on here put ferrite rings on the leads to the injectors. That was an early Offplanet Thread. Gary added a ferrite ring to each injector and wound the injector lead around the ring on a Sherpa Van that had RF-Noise from the injectors. I believe it was successful and Gary said, "not a 100% cure, but a vast improvement" See Post #6 on the Thread at http://s3.zetaboards.com/copythat/topic/7522901/1/



Sam WD40	21 Apr 2012 - 16:01 Post #5
26 Charlie Tango 747 Posts: 784 Group: MemberAF Member #747 Joined: 2-Jan 2011 MANDATORY_Country England MANDATORY_Location Kettering Northants MANDATORY_FirstName Sam	piezo crystal injectors are a pain in the arse VW's the worst for them along with IVECO van's and truck's followed by Range~Rover diesel engine you will not 100% get rid of the noise but it's trial and error with ferrite rings and filters ! good luck !



26SB131	22 Apr 2012 - 09:47 Post #6
26 Charlie Tango 131 Posts: 57 Group: Member Member #1,903 Joined: 20-Oct 2011 MANDATORY_Country England MANDATORY_Location Wigan UK MANDATORY_FirstName Adrian	I own a VW Golf 2.0 GT TDI and don't get any noise at all on any of my radios so not all VW's are affected. I also leave it running when out DXing and the only noise I suffer is the local p***pots on the bands 26CT131



NightRunner	23 Apr 2012 - 22:36 Post #7
26 Charlie Tango 609 Posts: 33 Group: Member Member #1,648 Joined: 27-Aug 2011 MANDATORY_Country England MANDATORY_Location Shrewsbury MANDATORY_FirstName Richard	Thanks for your suggestions folks, I will try the ferrite rings and let you know



NightRunner	3 Jun 2012 - 19:56 Post #8
26 Charlie Tango 609 Posts: 33 Group: Member Member #1,648 Joined: 27-Aug 2011 MANDATORY_Country England MANDATORY_Location Shrewsbury MANDATORY_FirstName Richard	Now for an update, Having taken the advice on here I have fitted ferrites on the injectors, and rewired the radio thru the fuse box instead of straight to the battery. The ferrites have made no difference at all, neither has taking the positive from the fuse box. But interestingly, not helpful, taking the earth directly to the body of the car close to the radio made things even worse, so I now have the negative direct to the battery and the positive to the fuse box. This car is causing me a nightmare, as nothing makes sense especially as I have now put rigs in 6 of these cars and only one of them is causing any type of interference. I have also swapped everything out of this car and into another and the interference stays so no probs with the equipment, Any further ideas on how to resolve this we be great fully received



ColdZero	3 Jun 2012 - 21:47 Post #9
26 Charlie Tango 2168 Posts: 503 Group: MemberAF Member #1,215 Joined: 21-May 2011 MANDATORY_Country England MANDATORY_Location Kernow and a Celt MANDATORY_FirstName Martin	Are you certain its the injectors...? One good test ...all modern vehicles have `fuel shut off` on overrun, so a good test is to see if the noise is still there going down a hill off the gas.. but still in gear so the engine is revving . If it still is then it may well be the alternator. My fault existed with the antenna disconnected as well as connected so ruled out RF pickup via the antenna. I have just sorted the exact same fault on my 11 plate trafic van... I had audio from the radio that sounded like a zzzzz type noise even with the volume all the way closed. It changed pitch with increasing engine revs. This is what I made to fix the noise ... the fuse end of the red cable goes direct to 12v live, then I wound a random number ( 17 ) of turns around a philips screw driver blade and taped to secure ,then several turns through a clip on ferrite ...worked perfect for me ... Edited by ColdZero, 3 Jun 2012 - 21:51.



ColdZero	5 Jun 2012 - 21:38 Post #10
26 Charlie Tango 2168 Posts: 503 Group: MemberAF Member #1,215 Joined: 21-May 2011 MANDATORY_Country England MANDATORY_Location Kernow and a Celt MANDATORY_FirstName Martin	Did ya try it or No ?



Sgt Bilko	8 Jun 2012 - 14:23 Post #11
108 Charlie Tango 302 Posts: 154 Group: MemberAF Member #1,360 Joined: 18-Jun 2011 MANDATORY_Country Scotland MANDATORY_Location Prestonpans, East Lothian MANDATORY_FirstName Paul	Its like a good book but only the last page with who dunnit missing. LOL



Whitey	8 Jun 2012 - 22:05 Post #12
26 Charlie Tango 646 Posts: 292 Group: MemberF Member #1,787 Joined: 28-Sep 2011 MANDATORY_Country England MANDATORY_Location North Yorkshire MANDATORY_FirstName Joe	Now your scaring me, I've never had any problems with Diesels and Radios, always problems with petrols though. This is why I've just ordered a new Ford Galaxy TDCi. My Mondeo has been fine, so hope the Galaxy beast will be the same.



NightRunner	9 Jun 2012 - 17:48 Post #13
26 Charlie Tango 609 Posts: 33 Group: Member Member #1,648 Joined: 27-Aug 2011 MANDATORY_Country England MANDATORY_Location Shrewsbury MANDATORY_FirstName Richard	Now for another update although no progress, the driver of the vehicle is complaining of getting a static shock off it every time he gets out, which to me would suggest a general earthing problem with the vehicle so the next item to try is some star washers on the main earth connections to engine and body to ensure they have a good connection. Thanks cold zero I will get some more ferrites and try making a choke like you describe, although it does already have a commercially available choke on it but not sure how good they are so will try your tried and tested method. And yes the noise disappears on over run that's why I think it's injectors. Meanwhile keep the suggestions coming I am all ears, and determined to solve the problem.



Cherokee	10 Jun 2012 - 15:51 Post #14
Da Injun Posts: 12,976 Group: Admin Member #6 Joined: 24-Jun 2009 MANDATORY_Country Wales MANDATORY_Location The Vale of Glamorgan MANDATORY_FirstName Steve	Nightrunner 9 Jun 2012 - 17:48 Now for another update although no progress, the driver of the vehicle is complaining of getting a static shock off it every time he gets out, which to me would suggest a general earthing problem with the vehicle Now I know it is nothing to do with Radios, but THAT confuses me!! With my albeit limited experience, I have found that the vast majority of vehicles actually lack a ground earth for static, due to (generally) being supported away from the ground on rubber clad wheels. There was a craze back in the 50s or 60s for a little chain or earth strap to be attached to the back bumper and dangled to the ground which would, so the manufacturer claimed, "Stop car-sickness" (the claim was pure snake oil of course). But I do remember my mother wanting one on Father's car because she would frequently get a static kick when exiting the vehicle, but only when she wore a lot of man-made fibre clothing (typically nylon). Your driver isn't rather fond of wearing 1960 ladies fashions is he?



NightRunner	10 Jun 2012 - 16:14 Post #15
26 Charlie Tango 609 Posts: 33 Group: Member Member #1,648 Joined: 27-Aug 2011 MANDATORY_Country England MANDATORY_Location Shrewsbury MANDATORY_FirstName Richard	Lol, not that iam aware, although I won't be asking him what underwear he prefers . I am led to believe that static build should not be a problem with modern tyres as they have a carbon strip in them to provide an earth route thru the tyres, although I suppose this would only provide a very low level of static earthing so assume this car for some reason is generating a large amount of static for some reason!



Mulletmeister	11 Jun 2012 - 08:06 Post #16
26 Charlie Tango 682 Posts: 248 Group: MemberF Member #2,007 Joined: 8-Nov 2011 MANDATORY_Country England MANDATORY_Location East Sussex MANDATORY_FirstName Chris	I have an 11 plate Peugeot Partner 1.6 diesel and after much trying, I have given up trying to eradicate the noise. Mine isn't so much the injectors, but the ABS / EBD! When on the over run and braking it makes a whine like someone changing down gears on a motorbike / formula 1 car! Had it all checked out and it could be due to my taxi meter being fed by the ABS senders as that is where the pulse is detected. My injector noise disappears above 2,000 RPM I do have to make certain allowances for my car as it has a large electro magnetic wheelchair restraint system, a taxi meter, a taxi radio, an electric winch and a myriad of other electrical devices! Apparently a lot of the noise on modern diesels is due to the common rail system. the injectors almost fire like a traditional spark plug would. Isn't modern technology wonderful.............



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