Lotus Elan

Will not start

PostPost by: bulfin » Tue Mar 13, 2018 8:50 pm

Hi All,

My S4 Elan has not run in a while due to some suspension work and and me moving 220 miles away. I was at my old shop last week and tried to crank it, with no success. The gas was drained and fresh fuel added. Pulled the plugs, disconnected the coil etc and turned it over. After reconnecting, it turned over and sounded like it wanted to crank, but didn't. I tried with choke on and off - no difference. I ran the electric fuel pump and gas is getting to the T between the Z-S carbs. Pulled a plug and got good spark. Also had good oil pressure while turning it over. Took off breather and filters, held up the damper and sprayed starter fuel in and it caught a little, but died quickly. I ran the battery down, said a few four letter words and then went to other tasks (getting the house ready to sell) I needed to do while I was there.

Air, spark and fuel - the only thing I can figure is that the gas may not be getting to the spark plugs. I should have tried to flood it and checked the plugs, but I didn't. I know next to nothing about carbs, so is that the problem?

I will go back later this week and try again, so any and all suggestions gratefully appreciated.

Thanks,

Bob
Bob Bulfin
1969 Elan S4 DHC
Mobile, AL USA
bulfin
Second Gear
Second Gear
 
Posts: 77
Joined: 23 May 2012
Location: Mobile, AL USA

PostPost by: paddy » Tue Mar 13, 2018 9:10 pm

You can tell if fuel mixture is reaching the cylinders by removing a plug and turning the engine over - you'll smell the fuel if it's there.

I would guess maybe stuck needle valves or perished/split diaphragm?

Paddy
1963 Elan S1
User avatar
paddy
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1148
Joined: 27 Oct 2008
Location: Woking, Surrey

PostPost by: Gray » Wed Mar 14, 2018 9:36 am

If all was working well on last use its unlikely that something has happened to the timing but not impossible, distributor drive pins have been known to shear, chains jump, etc.

A quick check that spark coincides with compression, but take care doing it. Remove a plug. Hold plug to earth or use a spark tester, finger over plug hole to check compression stroke, or use a compression tester, third hand or helper to turn ignition on and engine over.

Good luck
Gray
Second Gear
Second Gear
 
Posts: 184
Joined: 27 Feb 2010
Location: Devon

PostPost by: jono » Wed Mar 14, 2018 10:37 am

are the float bowl filling - stuck float/valve perhaps?

I had exactly the same on my classic Alfa after layup. Took the float cover off and dry as a bone (mech pump was not pulling enough) - filled the bowls and started first time.
jono
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1485
Joined: 17 May 2007
Location: The wet bit in the top corner of England

PostPost by: bulfin » Thu Mar 15, 2018 8:05 pm

Thanks all for the replies. A few more things to try when I am with the car next week.

Bob
Bob Bulfin
1969 Elan S4 DHC
Mobile, AL USA
bulfin
Second Gear
Second Gear
 
Posts: 77
Joined: 23 May 2012
Location: Mobile, AL USA

Total Online:

Users browsing this forum: rgh0 and 9 guests