Jump to content

TR6 PI NOT RUNNING PROPERLY


Recommended Posts

I assume  you don't have a carb distributor with a vacuum line connected.

I'd connect a vacuum gauge to the brake booster connection and check the vacuum is stable and falls when you open the throttle- no burn't valves etc.

If the vacuum's stable and the timing's right you have a distributor problem

Link to post
Share on other sites

Sounds like you may have a combination problems. As you just replaced the MU and distributor, the most likely cause is in one or both of those, or in the stuff you disturbed in the process. Where did you source the replacements from?

The erratic timing can only be either a worn distributor or, at a stretch, tired harmonic balancer rubber. Most likely distributor. Shouldn't cause the lack of response though. I'd call the supplier and get their opinion. Was it fully reconditioned? I had mine done by Martin Jay and the timing is rock-solid.

The lack of response could be any number of things. I'd start by re-timing the distributor. At the risk of teaching you to suck eggs, are you certain you have the firing order correct, and that #1 is firing at the correct time in its stroke (i.e., you're not out by 1 cylinder)? Then I'd do a tongue test on the MU hose to check the vacuum chamber & hose aren't leaking. Follow that by ensuring the fuel enrichment lever on the MU is returning fully to the closed position.

Next on my list would be to look for ignition faults. Start up in a dark garage (yes, leave the door open, it's not that bad!) and look for tracking. Swap the plugs, points and rotor arm. Leads less likely a problem, assuming they're properly seated.

After that, it's time to re-balance butterflies and check the valve clearances. And have a drink.

Please report back. This forum is a great source of knowledge, much based on frustrating experiences!

JC

Link to post
Share on other sites

Hi,

two thoughts;

What about refitting the original distributor, not too much work and that might prove if the new one is the problem or not. Secondly, what RPM is the car idling at, and is it stable? Mechanical ignition advance comes in around 900 RPM, so could the movement of the timing marks be due to erratic engine speed rather than a problem with the distributor?

Mike.

 

Link to post
Share on other sites

Many thanks everyone for the advice.

Car now seems to be running reasonably well,starting straight away, ticking over at 800-900 rpm and revving up OK. Timing still slightly erratic but maybe it is the distributor kicking in.

Not sure what has made things better. Looked at the Triumph book rather than the Haynes manual and misread the ignition timing instructions and set at 24BTDC. Engine ran smoothly at that, then I realized the mistake and set back to 12BTDC and it still runs OK. Need to take it out for a run to see how it performs on the road.

For info the distributor is original, just back from Martin Jay, metering unit and injectors reconditioned by Neil Ferguson and bosch fuel pump, filters and relief valve from Malcolm in Wrexham so there shouldn't be any reason why it won't run OK if I have set up the timing properly.

Eddie

 

 

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.