2.25 hesitation from idle

**series3** · 27th November 2010, 01:55 PM

Hello everyone,

As the title suggests, my 2.25 has a noticable hesitation from idle. If I roughly plant my foot down from idle the motor will either conk out or almost conk out. I think the car may be a little down one power, however I cannot really confirm this.

As long as I am smooth and slow with acceleration, the mid and top range are fine. I have found myself riding the clutch on hills to get it going when cold.

I have checked the idle, mixture, tappets, points gap, sprayed wd40 looking for leaks but nothing has eliminated the problem. Tappets helped a little, though. I also tried to backfire the carb by swapping over leads, but it didn't help.

Its a newish 2.25 with a Zenith, diesel pistons, extractors and a 2.25 inch exhaust. Would the new exhaust system require the carb to be re-jetted or the timing to be advanced/retarded? Or is it something like a warped top cover?

ps. I just wound in my mixture screw and the car slowed down to a stop. Warped top cover eliminated?

Thanks,

Sam

**bee utey** · 27th November 2010, 02:03 PM

Check for operation of the accelerator pump. Lift the air intake with the engine off, operate throttle and look for a jet of fuel squirting down the throat. You may have too much or too little.

**Rainer** · 28th November 2010, 01:23 AM

Hi,

¿ Have you checked the distributor timing ? If you also have vacuum advance that should work correctly too.

I remember when I got mine 8 years ago just by rotating the distributor it improved a lot.

regards Rainer

**JDNSW** · 28th November 2010, 03:49 AM

Guessing, partly blocked idling jet, or possibly incorrect assembly of the link to the accelerator pump. Not the usual symptom, but make sure the heads of the screws holding the emulsion block to the top cover are not bottoming on the body of the carby. Another possibility is that a faulty thermostat is preventing it from warming up properly.

John

cheerychops · 28th November 2010, 09:02 AM

mine was doing that and it was partial block in hard fuel line in the carby just before the needle float

**series3** · 28th November 2010, 11:43 AM

thanks everyone, ill start investigating.

I found this article which helped me getting my bearing on the 36IV, it may help others.

http://www.legionlandrover.com/manua...arburetter.pdf

**Walrover** · 30th November 2010, 08:11 PM

Recently had similar issues with my 2A Zenith. Recommend you grab the throttle spindle (the bottom one) and give it a yank and see if it moves as mine had worn out the main body of the carby and was sucking in air causing the running problems. A new carby body fixed the problem.

Glen

**isuzutoo-eh** · 3rd December 2010, 07:50 PM

I heard that retarded timing could cause just such a problem

BobsLandies' timing light shone the way

**series3** · 3rd December 2010, 11:04 PM

Thanks Mark, and Bobslandies for borrowing the timing light. I checked the operation of the accelerator pump, and everything was in order. So I had a look at the timing.

The timing on my car turned out to be super-retarded, something like 10 degrees i think. With that fixed, the flat spot was gone. All that power i thought was missing has returned too.

Isn't it great when you get a nice, easy fix?

**bee utey** · 4th December 2010, 09:06 AM

If you are still running points you can do static timing very easily. Just rotate the engine forwards so that the points open (producing a spark with the ignition on, cap off!) as you pass the timing position. You should check points adjustment and timing every 1500 miles at least.

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