Hesitation under load

[Daveymaclad]

Hi guys

The great news is my UR's finally got a new MOT on it. The not so great news is that my car still has a small running issue.

So, when parked up the engine revs free and cleanly through the range but when out and about driving it gets to 3,000 rpm and then hesitates not going up in revs at all.

So far I've been told it could be two things:

Meine air temp sensor ist kaput. I've replaced with a 22ohm resistor but am unsure if that will help or hinder the running under load problem I have.

My distributor was refitted 180 degrees out and have been told to check the rotor arm to see if it's showing burnt signs or not.

What's other peoples thoughts on what could be causing that hesitation at 3k rpm? Would either/both of the above cause/remedy the problem or are there other things I should be looking at ahead or in addition to those?

As always many thanks

Dave

[john johnson]

Send me a picture of your rotor arm .... I have a shelf full and can send one down to plop on to try

[msh]

Resistor in place of IAT sensor means incorrect air mass calculation, used here to determine engine load for ignition timing and boost control [I guess?] purposes, but unlikely to cause something that severe. What does "My distributor was refitted 180 degrees out" mean?

[Daveymaclad]

Originally Posted by msh

Resistor in place of IAT sensor means incorrect air mass calculation, used here to determine engine load for ignition timing and boost control [I guess?] purposes, but unlikely to cause something that severe. What does "My distributor was refitted 180 degrees out" mean?

Best explained with photo's! Will get car back in the morning so will post then. But essentially the plug for the wiring to the distributor should be facing the bulkhead. Mines facing the front of the engine bay.

[msh]

That shouldn't mean anything - apart from cosmetic considerations [dunno about early engines, late 5 pot engines uses covers with three sockets raised and HT lead plugs in 90 degree angle, making any but one correct combination looking messy, with leads pointing in all directions] , distributor plug could be facing any direction, as long as rotor arm is positioned correctly.

[Daveymaclad]

Originally Posted by msh

That shouldn't mean anything - apart from cosmetic considerations [dunno about early engines, late 5 pot engines uses covers with three sockets raised and HT lead plugs in 90 degree angle, making any but one correct combination looking messy, with leads pointing in all directions] , distributor plug could be facing any direction, as long as rotor arm is positioned correctly.

That's what I thought and has been said to me - cosmetic. Just wanted to put it out there in case it did mean anything else!

I'll get the cap off tomorrow and take some photo's of the rotor arm in case somethings amiss there.

Cheers