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ks114  



Joined: 23 Nov 2016
Posts: 13
Location: Kansas

PostPosted: Thu Jan 12, 2017 12:40 am    Post subject: Stupid question Reply with quote

Hi guys, I need some help. I've got a 1981 924 with a Weber conversion. I've had an intermittent spark problem. We've replaced the pickup sender and the ignition control unit on the left fender and the ignition switch. Also the coil. My question is, does the ECU (under dash) still do anything since the fuel injection is gone? Thanks in advance.
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RC  



Joined: 25 Mar 2007
Posts: 2624
Location: Australia

PostPosted: Thu Jan 12, 2017 2:18 am    Post subject: Reply with quote

There was never any factory ECU (Engine Control Unit) fitted to these cars, under the dash or elsewhere. Some guys have fitted aftermarket ECUs like Megasquirt but they don`t use carbs.

Perhaps that is an immobilizer, some ignition system, or other electronic box of tricks installed under there? How about taking a photo and posting it so we can try to identify what you may have.

Better to ask a stupid question than remain ignorant forever.
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World`s quickest 924 2L slushbox

Allan @ DTA wrote:
I have no issue with superchargers, they are for guys who want to drive a car rather than talk about horsepower with their baseball cap on backwards
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ks114  



Joined: 23 Nov 2016
Posts: 13
Location: Kansas

PostPosted: Thu Jan 12, 2017 2:31 am    Post subject: Reply with quote

It is the Bosch labeled box 0 280 800 037 931.617.101.01
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RC  



Joined: 25 Mar 2007
Posts: 2624
Location: Australia

PostPosted: Thu Jan 12, 2017 3:12 am    Post subject: Reply with quote

OK, that is the lambda control box, very early tech add-on to mechanical CIS. It won`t have any effect on anything, ignition timing or the Webber, so can be removed or disconnected or simply ignored.

Probably a good time to fully recheck ALL electrical connections & wiring, particularly the earth/ ground connections, common problem area. Remove all connectors & clean, tighten, etc.Remove ceramic resistors and check for open/ suspect windings & the whole loom too.
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World`s quickest 924 2L slushbox

Allan @ DTA wrote:
I have no issue with superchargers, they are for guys who want to drive a car rather than talk about horsepower with their baseball cap on backwards
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Raize  



Joined: 18 Sep 2013
Posts: 83
Location: UK

PostPosted: Sat Jan 14, 2017 8:27 am    Post subject: Reply with quote

I've had intermittent spark problems a few times. What it was for me:

1. Loose/broken HT lead.
2. The wire from the starter to the coil was shorting to ground.
3. Fouled plugs (924 seems ridiculously intolerant of fouled plugs!)
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ideola  



Joined: 01 Oct 2004
Posts: 15501
Location: Woodstock IL

PostPosted: Sat Jan 14, 2017 10:42 am    Post subject: Reply with quote

Could you be more specific about the symptoms? Intermittent spark could be many things, and could be interpreted many ways. Is it a misfire? Or is it a problem where you get absolutely NO spark causing no start or dying while running?
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15 981 GTS | 88 924S SE | 82 931 Holbert | 82 931 Rallye | 81 937 | 81 Euro 931 | 81 Weissach | 80 US 928 | 80 US 931 '941' | 80 US 931 | 80 931 GTR | 79 Sebring | 78 D-Prod Replica | 78 w/D-Prod kit | 78 Poli-Form | 78 Limited Edition | 77 Martini
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nickthompson  



Joined: 26 Mar 2013
Posts: 854
Location: Central Georgia

PostPosted: Sat Jan 14, 2017 1:45 pm    Post subject: Reply with quote

Add a MSD 6a box in there since you have the whole fuel system gone. Might as well do after market ignition.
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