i have a 86 t/a 5.0 H.O. this prob just started when the car sits overnight it will not start unless i hit the accelarator 1 time while cranking then its fine all day? any sugestions would help me out alot btw tune up was done 6oo miles ago fuelfilter included.mas was replaced and computor was cleared no codes at this time thanks

 

Is it Tuned Port Injection or carb!!!!!

Never heard of an "HO" TPI engine!!! Only carbed engines were marketed as "HO" to my knowledge!!!

If it's carbed you're supposed to step on the gas before starting, to set the choke!!!!

If it's TPI, check your Throttle Position Sensor voltage!!!

You seem to like a lot of exclamation points, hope these were enough for you!!!!!!!

 

ok thanks i was told about the h.o. but dont know that to be a fact but it is a tpi motor.i will check the sensor but do you think it would be that if after the car starts the first time by hitting throdel and then is fine the rest of the day???? it just has me confused thanks

 

The deal about the HO TPI comes from the RPO decoder here. When you look up LB9 you get "LB9 : ENGINE, GAS, 8 CYL, 5.0L, TPI, HO"..

 

i had a problem similiar to this a while ago pull the vacuun line of the pressure regulater if you see gas the diapham is bad replace it