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deverett

I'm finally on the road

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My Esprit is finally registered. I bought it in May of last year, shipped it to Australia and now have registration.

Now I just need to get the engine running right. It went well when it first arrived but after a Lotus specialist replaced the cambelt and "tuned" it, it seems to have more in common with a VW beetle. It even sounds a bit like one.

It idles lumpy, wants to die when you try to take off, so I have to heel and toe to get away. The revs don't die quickly either like they did before when you release the accelerator and it often detonates at switch off.

It's been 20 years since I worked on a car with carbies and even then they were a bit of a mystery to me so I'm really not sure how to diagnose the real problem here.

Dave Everett

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Two good things there.

You've got your Esprit and you know who not to go to for any future work.

How serious was the tuning, just setting carbs, altering timing etc or was it, altering Cam profiles, porting etc?

The former can be overcome simply by having somebody return it to stock settings, the latter would be more involved.

Anyway, glad you've got it home OK, and now the fun begins.

Andy

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Excellent news Dave - well done. :lol:

It sounds like the mechanic has knocked it out of tune - and you will have to step through the process. There are a number of topics on tunning, but simply it is float heights, points (dwell), synch, mixture rates, timing in that order (or so).

Can't wait to see it in Brisbane.

Iain

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I assume 'tuning' simply means adjusted things to make it run 'better'.

There is a page in the Lotus manual to tune the car, probably worth systematically doing these checks.

Before actually twiddling anything, I would check the cam timing is correct - as we know it was recently changed and the car has not run right since (see manu al to check alignment of the dots).

I would then maybe look at the plugs to see whether they are, black,white, wet, dry, all the same or all different

One of the actual symptom you mention re-revs, is consistent with the engine still being fed air after you close throttles - This could easily be caused by a badly adjusted linkage. If it was mine, I would hook it up to a manometer to check the balance.

The good news is that these cars dont have any sophisticated engine management, so assuming its not a faulty component, there is a finite list of relatively simple checks that dont need any particularly special tools , maybe a 4 cyl manumeter, pressure gauge. strobe and something to check the mixture (or simply keep checking your plug colour/condition - which is all I do, and isn't as ridiculous as it sounds on a fixed jet carburretor).

As mentioned previously - Items to check, not in any particular order

Ignition timing

Balance

Mixture (mixture screws, float hights, & fuel pressure) - maybe also check jets are stock

also check your choke is not stuck on.

'running on' is bad as it suggests that something is getting very hot - not ideal in any car. dont wait too long before fixing it

cheers Steve 84 turbo

Ahh - no turbo - no pressure regulator - one less thing to check!

Edited by 910Esprit

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Before you start making any changes get yourself the factory repair manual and sit down and read the information on tuning to the point you can recite it in your sleep. This way you don't have to stop and refer to the manual while working.

Inspect the vacuum hose(s) and verify they are routed correctly.

Get yourself a "Morgan Carbtune" to sync the carbs http://www.carbtune.com/carbcust.html

Have a good timing light preferably with an dial in advance.

If you have access to a air/fuel gauge that will be even more helpful. INNOVATE makes a real nice one that also data logs http://www.innovatemotorsports.com/

With the right tools, patience and knowledge you should be able to get it done correctly.

Good luck,

Jeff


www.espritturbo.com

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Good news Dave, I know how hard it can be to get things done in NSW :)

Steve is right, just try to get it back to "factory" settings....cam timing, dissy advance, balanced carbs, mixture settings.

....and above all, enjoy yourself!

Robert


Robert Costa
1984 Turbo Esprit
Very Black!
2004 Lotus Elise
Quite Green! gone :-(

1977 S1 Esprit, in bits

1998 Lotus Elise S1, Azure Blue
Sydney, Australia

“The parts falling from this car are examples of the finest British craftsmanship”

Recommended procedure before taking on a repair of Lucas equipment: Check the position of the stars,kill a chicken and walk three times clockwise around your car chanting:" Oh mighty Prince of Darkness protect your unworthy servant.."

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Sounds like your mechanic has tried to set up the car for low emissions and leaned out the mixture. My car was the same until I richened up the mixture. Fixed the low-speed stumbling and running-on. He may have also retarded the timing although just having an overly-lean mixture will need the throttles open more at idle which encourages running-on and keeps the revs up when you lift off.

Should be easy to fix if you follow the advice the others have given above.


S4 Elan, Elan +2S, Federal-spec, World Championship Edition S2 Esprit #42, S1 Elise, Excel SE

 

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Thanks for the advice guys.

Andy, the tune was carbs and timing only. They claim that the butterfly valve arm seals ar leaking air into the system. I did actually find some moisture on one of the rods this morning, so it's possible it's contributing.

Steve, it's not running on, just when the engine stops I get a pop.

The stumble is only from idle. I took off up a local hill here about 3/4 throttle and it lept away so the power is there. Capped the revs at 4500 up to 4th. I ran out of road so I couldn't get to 5th.

I will order the tool recommended, they look great and will make the process so much easier. I can recall listening to my SUs through a tube on one of my Minis back in the 80s to get things balanced :) So primitive.

Dave Everett

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Good to see you've made significant progress.

Can't you take it back for them to fix the tune? It seemed to be running perfectly when I last saw you. Then again tuning it yourself may be the better way to go. Not too difficult with the right tools.


DanR

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Thanks for the advice guys.

Andy, the tune was carbs and timing only. They claim that the butterfly valve arm seals ar leaking air into the system. I did actually find some moisture on one of the rods this morning, so it's possible it's contributing.

Dave Everett

For the sake of

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Sounds like your mechanic has tried to set up the car for low emissions and leaned out the mixture. My car was the same until I richened up the mixture. Fixed the low-speed stumbling and running-on. He may have also retarded the timing although just having an overly-lean mixture will need the throttles open more at idle which encourages running-on and keeps the revs up when you lift off.

Should be easy to fix if you follow the advice the others have given above.

Trevor, I think they just riched it up to hell. I went for an emissions test after they'd done the tune and the results showed lots of fuel with very little air.

NOX was about half normal, CO was double.

Dan, I'm not keen to take the car back to them. I already did that once and it's not that much better now.

As it is I had a small hole in the manifold which has just gotten bigger. It actually makes the car sound more like a real sports car :welcome: Still I will have to get that fixed.

The Dellorto kit sounds like a good idea. The service manual is pretty clear about the carb operation so I should be able to tackle that without too much trouble.

Dave Everett

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