Jump to content

TR6 stalling when warm


Recommended Posts

Hi folks 

I’m new to this forum and I’m hoping someone can help me with an issue I have with my 6. I have basic mechanic abilities,  Ie. engine service, brakes etc but I’m learning. 
I have a 71 PI. Car starts from cold, ticks over nicely then begins to stall when reaches temperature and cuts out completely when hot. I’ve replaced plugs, points, condenser, rotor, coil & fuel filter. Problem persists, runs well until it gets hot then starts stalling before cutting out completely. Choke seems to be functioning normally. When it’s running I can feel fuel pumping to the MU and to the injectors. I’m assuming it must be either fuel or spark and I seem to have both. I’m wondering if it’s something to do with the metering unit or Bosch pump. 

Any thoughts on this would be gratefully received.

...just thought. It might not be due to heat as it was idling normally and when it got to normal temperature I gave it a small amount of throttle and it starting stalling. So maybe a fuel delivery issue? 

Edited by pauljh
Link to post
Share on other sites

If you have an idle air valve at the front of the number 1 inlet manifold you may have to open it to increase the amount of air at idle speed, let us know if you have this and did it allow idle speed to increase.

If that doesn't work you will have to adjust all the throttle rods and balance the inlets to open the butterflies all the same amount.

john

Link to post
Share on other sites

Was the engine running fine prior to this fault or has it appeared to have gradually developed? and have you changed anything prior. While warming up can you rev her without stalling?

From the sounds of it it might be that as the fuel pump warms up it can't deliver enough fuel so check the pump has 12-13v or better and clean the earth to the pump. What's the fuel pressure at the metering unit should be around 105 psi if I remember correctly.

I'd be tempted not to adjust anything before checking or you might add other variables to your issue.

Andy

 

Link to post
Share on other sites

Andy, thanks for this. Engine was running fine prior to fault so developed suddenly. First time it happened I had black smoke from the exhaust but since changing electrics this hasn’t happened again. Only job I did on the same day it first happened was remove gear stick to fix rattle in 3rd, it was when I went to test drive It that this fault occurred, didn’t think it could be related. I can rev whilst its warming then splutters and dies as soon as it reaches temperature. 

The possible issue with fuel pump makes sense and I will do the checks you suggest. I don’t know PSI at MU but I’ll attempt that check too. Thanks again for the suggestions. 

Link to post
Share on other sites

I would check the plugs as suggested above wgen hot, after stalling, see if the give an acceptable spark, on all 6 of em.

If they do not spark, replace by new ones. If ok, likely a fuel issue. 

Did you fit a new red rotor or a black one with a rivet? The last one is known to fail.

Waldi

Link to post
Share on other sites

Thanks for all your replies on this. I’ve checked fuel pump, is getting 12v, cleaned connectors and seems to be working OK. Tried to fire it up this morning, wanted to to start then nothing. Checked the plugs,  soaking wet. Ignition parts have all been replaced, plugs, points, coil, cap, condenser, red rotor arm.  HT leads new last year. Was on the button when I replaced these parts yesterday and idled nicely until it got hot and I flicked the throttle. Not sure why it won’t start now but I think I’m moving beyond my skill set! 

Link to post
Share on other sites
18 hours ago, pauljh said:

Thanks Jim, I did check that and the lever appears to be in the fully returned position.   

Hi, the lever can return to the off position and the enrichment cam can still be in the rich position.

Put a finger down between the block and the MU and you will feel a nut on the enrichment mechanism. Push it very very hard towards the back of the car. It will click back a bit if it is still on.

This is a common problem, especially with cars that haven't been used regularly.

It happened to mine, exactly, and I mean exactly, your symptoms. I sprayed WD40 liberally down there and worked the mechanism backwards and forwards for 10 minutes. Problem solved.

Link to post
Share on other sites

Thanks for the tip, checked this again. The choke lever is fully returned. From what I can see this lever pushes a 2nd lever with a small adjustable nut and bolt. This second lever was as far as it would go towards the back of the car and firmly against the bottom of the choke lever. WD40’d everything but it didn’t appear stuck on. Cleaned the plugs, cranked it, almost fired up, checked the plugs, wet with fuel. 

Link to post
Share on other sites

Hi

I’m now thinking this might be an alternator issue. Car started today after allowing excess fuel to evaporate. Idled for a while then began to stall, finally stalling completely. I noticed that the AMP gauge needle was to the far left C+ when it was running, I don’t think this is normal. The battery was showing 12.7v when it was running, should this not be higher if the alternator is working properly? Apologies for the basic explanations but I’m still learning (the hard way). 

Link to post
Share on other sites

A healthy alternator should normally be giving around 14-14.3v at the battery.

Have you tried a fresh fully charged battery from another car with the alternator un plugged and see if she will start, warm and idle for you for longer? Or just whip the alternator off and have a auto electrical reconditioner test it.

Link to post
Share on other sites
  • 7 months later...

Hi all, apologies for the very late reply on this topic but thanks everyone who replied with their thoughts, it was very helpful. Problem was a faulty MU which I replaced with a refurbed unit and installed elec ignition whilst I was at it and now running sweet again. Latest job is a gearbox rebuild, I’m looking forward to actually driving it at some point!!

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.