abd engine that previously ran fine on carb

 

fitted all 3f mpi bits except the cam

 

starts from cold and sounds normal , quickly starts to sound rough with a unhappy idle , with the blue sender undone it runs worse ive attempted to set up the timing but unsure if the rough idle effects it..above idle it sounds better and drives semi okay 

 

when hot it will not restart - after one hour it starts again

 

tried 2x temp senders , new coil , ecu and (correct)dizzy works on my mates gt ,car has no o2 sensor at present,  fuel pumps are running when it refuses to hot start 

 

ive about reached the end of my knowledge and unsure what to do now   

Cooper insert for the starter?  Hg going? Isv or tps

 

Rough idle and warm start are probably sepserate issues. Does advancing the dizzy smooth it out

 

Which cam is in?

Edited 23 May, 20188 yr by kiran_182

cranks fine when hot just wont start

 

no reason to think its head gasket , its done 1500 on the carb sinse a reasonbly thourough rebuild , ive not touched the engine just took carb off and mpi on

 

runs smoothest where dizzy is now...5 deg , although with it running so ropey im not convinced its entering service mode as it should 

 

stock 1300 mh cam at the moment

Lack of lambda sensor could be the rough running 

If you wind the brass screw on the right of the tb out itll up the idle by altering the mix, 

 

Best to wind it down / right first to find out how many turns out it was.

Edited 23 May, 20188 yr by kiran_182

ive messed with the idle screw ...winding it in makes it slower , winding it out gets it roughly 900 ish but cant get it much higher , doesnt respond like it id expect it to

Jam a skrew driver under the throttle arm and start it up, see if incrrased revs make a difference

 

If it still bogs doewn with full throttle theres an air leak

does sound ok above idle

got a video for us?

Hi,

I had a hot start problem on my gt, I hunted for the problem for literally a year, changing pretty much everything without getting to the bottom of it. Found a work around, described below, until I replaced the battery for a different reason and it solved it. Unfortunately can’t explain why or the theory behind it but not had the problem since. 

  

Work around:

So once warm and not starting if you unplug the blue temp sensor and try to start the car, mine fired up and then cut out almost immediately, I’d then replug the blue temp sensor and it’d start fine. 

I ended up putting a break in the blue temp sensor wiring and fitting a switch on the dash, so I could basically just turn the switch off to disconnect the sensor then back on again to reconnect. 

Hope any of that helps