Hot running problems

I've got a 1990 460 1.7 with a carburetteur. When the engine gets hot it misses. This is particularly the case after sitting in traffic. When it's cold it runs perfectly so it's not a dirty fuel issue especially as I've put in an extra filter in the fuel line. Also, once in clear traffic and it sorts itself out and runs fine Could this be a heat soak problem resulting from a silted radiator causing fuel vapourisation in the fuel line? My old Range Rover had a similar problem with heat vapourising the fuel after a run, but they are known for silting the rads. Are 460s known for this problem? The other thing I was thinking about was to do with the fuel pump getting hot and sticking due to thermal expansion, especially as it's at the back of the engine where temperatures are likely to be highest. Does anybody have any ideas? Many thanks Peter

I'm by no way shape or form an expert on engines at all-especially with the 1.7 Carb, never seen one or worked on one. However, the 400's have been known in the past, to suffer from dodgy engine temperature sensors. Unless i'm mistaken, as you look at the engine from the front of the car it's either under the 1st sparkplug (little push on connector), or it's a red-ish looking one under plug no. 4. Just get some contact cleaner and spray both the sensors and press them on/off a few times. This may not make a sh*ts worth of difference, but worth looking at. Other than that, i'm out on this!

I have a radiator temperature sensor going cheap if you want to try that fram a 1.7 carb I have recently broken for parts

Is there a reason why the temperature sensor would cause a problem like this? Does it cause the mixture to be altered? The fuel pump is a mechanical one driven off the cam shaft so there's no electronic feedback there thanks Peter

Like i said, it's a bit over my head, but it's the sensor that has the tendancy to pack up, so it sends the wrong info to the ECU. Maybe worth taking them out and cleaning them anyway-doesn't cost anything, then it's one problem ruled out if it's just as bad!

No ECU! lol. At least you're making some headway with the problem, which is good. Make sure you keep the post updated, be interesting to see if you find the solution. Dan