Jump to content

Why is it doing this?


Recommended Posts

Long story (there’s a post way back) but in short what it’s doing now is starting, running on 4, blip throttle, backfires both ends, back carb starts flooding.

In getting to where we are everything obvious has been tried and everything that could go wrong has.

yes there is fuel, yes there is spark, no the timing isn’t out. Yes I have replaced the float chamber jets. Yes the carbs were set up properly. Yes the plugs were replaced and are not faulty (unlike the previous set of new plugs).

It’s a mystery and it’s getting on my nerves

Thank goodness the 6 works

JJC

Link to post
Share on other sites

If one of the carbs is flooding then:

1) float level set too high

2) needle valve leaking

3) fuel pump pressure too high causing 2 above

Bob.

Link to post
Share on other sites

Bob might be 1 but unlikely as float level checked when fitting new valve.  Why does it wait until after backfire to start flooding? If 2 then new valve supplier will get an earful, but see 1 above. 3 it’s a TR4 I should be so lucky! But if it was, front carb would suffer. 

Current plan is carb dismantle.

JJC

Link to post
Share on other sites

It backfires because it is flooded and fuel is building up in the venturi, it usually starts at the rear carb. Check if the oil level in the dampers is correct (engine oil Ok) 

Link to post
Share on other sites

Still using the original plastic floats? Perhaps one is damaged and a switch to the "stay up" nylophyl type may be in order. Also, what type of float needle are you using?

Edited by Andy303
Link to post
Share on other sites

Yes, the thought suggested to me is to compare the weights of the floats. They look like original floats so might be past it. What’s really annoying is that I paid to have the carbs rebuilt when I put the car back together. JJC

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...

Important Information

Please familiarise yourself with our Terms and Conditions. By using this site, you agree to the following: Terms of Use.