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  #1  
Old 09-14-2013, 06:41 PM
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78 240d glow plug light won't turn on

and neither will the car. Turns over but won't start. I replaced the glow plugs but that hasn't seemed to help. I checked the voltage and getting 12.4 to each one. Does anyone have any other ideas?

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Old 09-14-2013, 07:36 PM
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78 originally had loop plugs. does it still have them? Did you check the fuse on the firewall?
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 09-14-2013, 07:47 PM
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Quote:
Originally Posted by kerry View Post
78 originally had loop plugs. does it still have them? Did you check the fuse on the firewall?
Yeah i checked the fuse, appeared fine, was also getting 12.4v there. When i was replacing the plugs it had pencil plugs, but i replaced with bosch looped 80003 plugs.
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Old 09-14-2013, 07:56 PM
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What wires did you use? Loops require the heavy bent squiggly wires with insulators between the wires on each plug. If your pencil plugs were wired parallel, it explains why your loop plugs aren't working. Can you post a picture of the way you have them wired?
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #5  
Old 09-14-2013, 08:49 PM
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Quote:
Originally Posted by thephreaker View Post
Yeah i checked the fuse, appeared fine, was also getting 12.4v there. When i was replacing the plugs it had pencil plugs, but i replaced with bosch looped 80003 plugs.
The newer style pencil type GPs are way better for faster starts and use less power, why would you go back to the loopers?
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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Old 09-14-2013, 08:56 PM
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I'm guessing he went back to loopers because the retrofit pencil plugs with the large threads are harder to find. Not a step I would recommend.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #7  
Old 09-14-2013, 09:23 PM
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Not that hard to find az still has them, no idea why you would go back....but this is for sure the issue.....Bosch pencil upgrade part number 80035....its stamped in my head...
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Old 09-14-2013, 10:54 PM
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If you put 12 V to a loop plug, doesn't that blow it like instantly?
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 367,xxx miles
08 Triumph Street Triple 30,xxx miles, lowered 10mm in front, Pirelli Angel GT tires, EBC HH brake pads, otherwise stock.
88 Jaguar XJS V12 93,xxx miles. I should be in the garage now.
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Old 09-14-2013, 11:32 PM
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Quote:
Originally Posted by kerry View Post
What wires did you use? Loops require the heavy bent squiggly wires with insulators between the wires on each plug. If your pencil plugs were wired parallel, it explains why your loop plugs aren't working. Can you post a picture of the way you have them wired?
I used what was being used with the pencil plugs. Before I got these I didn't even know about pencil plugs and got them because thats what a catalog suggested.

see images




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Old 09-14-2013, 11:45 PM
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Well, that ain't gonna work.

The loop plugs, which were original to that year, are wired in series using special resistance wires between the plugs. As installed, you have no connection to ground, so the plugs won't glow. The easiest solution for you is to find some pencil style glow plugs that will fit. There have been periods in the last year or so when availability wasn't very good, but I think you can find the Bosch plugs at several vendors now. Unless you completely revert to the series wiring system, which is inferior, you have no choice but to locate some new pencil style plugs.
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  #11  
Old 09-15-2013, 12:08 AM
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I've had a '77 with loop plugs and an '83 with pencil plugs. Trust me, you want pencil plugs.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 367,xxx miles
08 Triumph Street Triple 30,xxx miles, lowered 10mm in front, Pirelli Angel GT tires, EBC HH brake pads, otherwise stock.
88 Jaguar XJS V12 93,xxx miles. I should be in the garage now.
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  #12  
Old 09-15-2013, 12:11 AM
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We all make mistakes, its a good thing you have a place to ask questions!

I would reinstall your old ones, and then return these and get the right ones....I can't post a link to where I got mine as they are on another site....

Here is a reference photo of the wires we are all talking about and spacers...


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  #13  
Old 09-15-2013, 01:27 AM
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Mystery solved
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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  #14  
Old 09-15-2013, 02:40 AM
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I will try new Bosch 80035 pencil plugs and report back. Appreciate the suggestions all
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  #15  
Old 09-25-2013, 03:31 PM
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Got the pencil plugs a few days ago and the car started up fine. Drove today to the gas station, put some gas in, now the plug light doesn't glow again. Car is stuck at the gas station

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