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 Post subject: 924S not starting
PostPosted: Sat Dec 19, 2020 6:44 pm 
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Joined: Tue Jan 19, 2016 7:52 pm
Posts: 9
Model: 924s
Hi, some help needed please

I own a 1986 924S which has been in my family for 30 years, the car is very looked after and usually runs very well, however after a two week layup I cannot get it to start, the car turns over but wont fire up. There seems to be no spark but it did try to start on a couple of occasions but just wouldn't catch.

I had this last month after another two week layup but the car did eventually start but ran rough for a bit at low revs but after I drove it for a while was fine and started fine the following day.

Battery is fine,
Fuel is getting through

Iv ordered new plugs as a precaution but am thinking its something else? Coil maybe?

Anyone else had similar. Was wondering if all this wet weather might cause an issue as car is kept outside but never had any issues before and car normally starts first turn of key in all weathers. I was told these 924s engines don't like being stood for to long...

Thanks in advance.


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 Post subject: Re: 924S not starting
PostPosted: Sat Dec 19, 2020 7:07 pm 
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Joined: Mon Jun 17, 2013 11:35 pm
Posts: 3404
Location: The little old village of Lingfield, Surrey
Model: '83 924 / '80 931
Quite a few potential points of failure on the S engine: Crank sensors, ECU, AFM, DME Relay. Do you know what these mean? Sometimes these can be unplugged and reconnected to solve an intermittent issue, but sometimes need to be replaced completely.

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 Post subject: Re: 924S not starting
PostPosted: Sat Dec 19, 2020 10:50 pm 
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Joined: Mon Jan 04, 2010 11:24 pm
Posts: 18091
Location: Gloucester
Is there any damp in the footwells?

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2004 Toyota MR2 Roadster Red Edition-Lock down project.
1984 924 N/A Ruby Red Metallic - 924 of the Show, National 2018
1988 924S Guards Red - sold
1986 924S Guards Red - sold
1984 924 N/A Black - sold
1980 924 LE MANS#1 - sold
1980 924 LE MANS#2 - sold
1977 924 Martini - sold


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 Post subject: Re: 924S not starting
PostPosted: Sun Dec 20, 2020 8:59 am 
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Joined: Tue Jan 19, 2016 7:52 pm
Posts: 9
Model: 924s
Yes I noticed some water on mat in passenger footwell


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 Post subject: Re: 924S not starting
PostPosted: Sun Dec 20, 2020 9:39 am 
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Joined: Thu Apr 26, 2018 1:51 pm
Posts: 730
Location: Brittany - France
Model: 924S 1988
althejazzman wrote:
Quite a few potential points of failure on the S engine: Crank sensors, ECU, AFM, DME Relay. Do you know what these mean? Sometimes these can be unplugged and reconnected to solve an intermittent issue, but sometimes need to be replaced completely.


^^^^^^^^ what he said.

Do you have tach bounce when you try to start? For my intermittent no start it was the connections at the back of the relay block where you plug the relays into it. One of the wires was not tight to the DME relay and had worked itself loose.....found out after buying two new DME relays......sometimes it's the simple things.
Keep plugging away, it will get solved!

M

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 Post subject: Re: 924S not starting
PostPosted: Sun Dec 20, 2020 9:51 am 
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Location: Gloucester
Water in the footwells is not good, in the passenger footwell it could be the result of a rust hole in the battery tray and all of th fuses and relays are situated immediately below it, in the driver's footwell it could be because someone has sited an alarm or similar in the area in front of the screen and collected water drains through fixing holes and drowns the DME control unit below.

Both areas need checking and you need to check the drainage holes through the bulkhead in each one as they can get blocked by leaves and debris.

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To travel hopefully is a better thing than to arrive - RLS

2004 Toyota MR2 Roadster Red Edition-Lock down project.
1984 924 N/A Ruby Red Metallic - 924 of the Show, National 2018
1988 924S Guards Red - sold
1986 924S Guards Red - sold
1984 924 N/A Black - sold
1980 924 LE MANS#1 - sold
1980 924 LE MANS#2 - sold
1977 924 Martini - sold


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 Post subject: Re: 924S not starting
PostPosted: Sun Dec 20, 2020 7:50 pm 
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Joined: Tue Jan 19, 2016 7:52 pm
Posts: 9
Model: 924s
mikseymono wrote:
althejazzman wrote:
Quite a few potential points of failure on the S engine: Crank sensors, ECU, AFM, DME Relay. Do you know what these mean? Sometimes these can be unplugged and reconnected to solve an intermittent issue, but sometimes need to be replaced completely.


^^^^^^^^ what he said.

Do you have tach bounce when you try to start? For my intermittent no start it was the connections at the back of the relay block where you plug the relays into it. One of the wires was not tight to the DME relay and had worked itself loose.....found out after buying two new DME relays......sometimes it's the simple things.
Keep plugging away, it will get solved!

M


Whats tach bounce, sorry for my ignorance on this.


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 Post subject: Re: 924S not starting
PostPosted: Sun Dec 20, 2020 8:16 pm 
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Joined: Mon Jan 04, 2010 11:24 pm
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Location: Gloucester
When you crank the car over the tach needle should jump off the stop

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2004 Toyota MR2 Roadster Red Edition-Lock down project.
1984 924 N/A Ruby Red Metallic - 924 of the Show, National 2018
1988 924S Guards Red - sold
1986 924S Guards Red - sold
1984 924 N/A Black - sold
1980 924 LE MANS#1 - sold
1980 924 LE MANS#2 - sold
1977 924 Martini - sold


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 Post subject: Re: 924S not starting
PostPosted: Sun Dec 20, 2020 8:28 pm 
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Joined: Tue Jan 19, 2016 7:52 pm
Posts: 9
Model: 924s
scm924s wrote:
When you crank the car over the tach needle should jump off the stop

Not sure to be honest on that, but I'm thinking it might be the dme relay after doing some reading, the symptoms I'm having do seem to point to this , was wondering if it got wet with this water coming into passenger side. Car is now under cover to keep any further rain out.
Appricate your help and advise on this.
Will try and locate the dme relay tomorrow.


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 Post subject: Re: 924S not starting
PostPosted: Sun Dec 20, 2020 9:35 pm 
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Location: Gloucester
The DME relay is top row on relay panel 2nd from left. Before playing with that, check the fuel pump fuse on the auxiliary fuse panel (passenger footwell LH side behind glove box) fuse no 2 numbering from bulkhead end, check contacts of fuse and in panel are clean.

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To travel hopefully is a better thing than to arrive - RLS

2004 Toyota MR2 Roadster Red Edition-Lock down project.
1984 924 N/A Ruby Red Metallic - 924 of the Show, National 2018
1988 924S Guards Red - sold
1986 924S Guards Red - sold
1984 924 N/A Black - sold
1980 924 LE MANS#1 - sold
1980 924 LE MANS#2 - sold
1977 924 Martini - sold


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