A fellow tiger owner has a problem with his car, running 2 litre zetec with R1 carbs and megajolt, Runs well for about a couple of miles then starts to misfire. The engine has been changed as it was thought a sticking valve may have been the problem, but the problem still exists. I have linked to the thread for the tiger forum.
edit the thread is in the technical forum under the heading misfire again. here
hoping some of the folk on here can help or maybe someone has had a similar experiance.

[Edited on 22/10/2007 by dave1888]

Hi,

I'm the poor sod with the problem Tiger.

After SVA, the car ran well for ~ 200 miles then had prob lem with overheating - hole in main hose was the culprit. At the same time the belt driving the engine water pump was not making proper contact thus the engine got really hot - it was at this point the misfire occurred.

Since then I have changed the following -
New plugs, Coil pack from second engine, leads from second engine, Oil again to ensure valves wont stick.

After the above, decided to change the engine. Now have a 2ltr April 96 Zetec fitted. Running Bogg Bros supplied R1 Carbs and manifold and Megajolt purchased from a fellow Locost builder.

Last suggestion was the air vent in the tank could be the problem. Removed the pipe between the tank and filler neck and added a pipe to an filter then went for another balst.

The usual happened - after ~ 1 mile, car misfires baddly then grinds to a halt. Wont starts straight away. Wait for 5-10minutes - car will start and can be driven back home.

On tonights run, when it conked out, I switched of the iginition removed the bonnet and checked out the filter. It was full of fuel, so no problem from back to front regarding fuel blockage.

So I now have built a super car that goes like stink for a mile, breaks down, then crawls back to the garage.

Boy am I really pissed off.

Any suggestions welcome.

cheers
JimM

ps Thanks Dave .....

Have you checked/changed the VR Sensor/EDIS/Megajolt??,

if you disconnect the PIP and SAW signals between the EDIS and M/Jolt does the fault still occur?(this makes the EDIS go into Limp Home Mode)

Are the Cables between the VR and EDIS, and the EDIS and Coipack shielded, with the shield grounded at one end only?



Ray

[Edited on 22/10/07 by rayward]

[Edited on 22/10/07 by rayward]

Has the fuel tank got a breather ?

Ie runs for a bit creating a vacuume and starves the carbs of fuel.

My dosh is on the fuel system

What fuel pump have you got? the carbs only need very low pressure otherwise they will flood. do you think the problem is electrical or fuel? I have them on a pinto with the standard mechanical pump and a fliter king on its lowest setting.

Hi Ray,

Funny you should be the first to reply ... as you built the Megajolt for me.

I've not touched the electrical side as yet, as the problem seemed to be fuel starvation.

I'll try and pick up another Edis unit from a scrap yard at the weekend. Can check out the Megajolt as no one near has came forward. (Dave1888 has offered his, but has non standard connectors so would need some mods before use - this would be a last resort).

Leads have been shielded and grounded at the EDIS side.

cheers
Jim

yes can check the MJ no problems, first test would be to disconnect the PIP/SAW as described above, as this will rule out the MJ if the fault is still there.

Ray

Pump is an R1 and Carbs are also R1 units. You hear the pump click a few times when ingition turned on then and stops when fuel is primed.

As indicated above, I checked out the tank breather tonight so thats another one of the list.

Keep them coming .....


Just dont know why it ran great for 200 miles then started acting up .....

[Edited on 22/10/07 by JimM]

I,ve seen something similar with rubbish in the fuel tank.

Car runs fine, then whatever is floating around covers the pickup, car splutteres and stops.

Turn off, suction drops off and the bit of rubbish resumes floating around the tank.

So, if the pickup is a tube with no filter always cut a V shape at the open end


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never cut it straight then it can not be blocked by a floating lump, in the case I dealt with it was a small flat piece of plastic, size of a penny.

If possible also put a wire filter on the end.

Another problem can be fuel pipe collasping when it gets warm, make sure no tight bends etc.

Regards Mark