Hesitation under acceleration

[NickB]

Hello - has anyone any ideas for issue that has started on my 89 4L?

Starts fine and runs ok on the choke. After 5 -15 mins driving if you back off the throttle and then accelerate agai, it cuts out quite harshly then clears. It doesn't happen every time. After 20 mins of driving it runs very smoothly and never does it. All ignition parts are less than year old, running on fresh petrol (v-max too). any ideas. Will idle from cold fine too. Confusued! Thank you very much for any thoughts

 

[reidalpine]

have a garage stick their nozzle up your poop-shute
Or-said in amore civil way: have them stick their probe into your exhaust-pipe
and scheck the Co-level (air/fuel mixture) -if set too lean/low ,your engine doesn't get enough petrol
making it stumble and stutter -Reid

 

[Miguel Verde]

I had a similar problem when I had the engine rebuilt in went to 1400 CC. It would stumble on acceleration and it was definitely a fuel problem we had to go with a much bigger jet in the carb. The mechanic was amazed I think it was a .135 made all the difference... I will add that I had it to several mechanics trying to figure this out after the rebuild and most of them thought the timing chain was installed incorrectly but they were wrong. It was all carburetion

 

[edwin]

If you want assistance with your carburettor, Carb Care of Lichfield are fantastic at sorting out any issues. The chap there travels the country attending to carb issues so can visit you car. They are on the net.

 

[NickB]

If you want assistance with your carburettor, Carb Care of Lichfield are fantastic at sorting out any issues. The chap there travels the country attending to carb issues so can visit you car. They are on the net.

Thank you very much - i will take a look

 

[NickB]

I had a similar problem when I had the engine rebuilt in went to 1400 CC. It would stumble on acceleration and it was definitely a fuel problem we had to go with a much bigger jet in the carb. The mechanic was amazed I think it was a .135 made all the difference... I will add that I had it to several mechanics trying to figure this out after the rebuild and most of them thought the timing chain was installed incorrectly but they were wrong. It was all carburetion

Thanks - I think I will get the carb rebuilt as it's intermittment but still frustrating!