Car Questions
RepairPal is your advocate for car care advice and guidance

Needs some throttle to start.

(1990 Chevrolet Celebrity)
in Rochester, WA on May 26, 2011
Why do I need some throttle pressure to start an EFI engine? By opening the throttle are you telling the computer more gas or more air? Fuel delivery checks good, pressure with no bleed back. No codes other than 12. Runs well but an intermittent problem with the engine cutting out when removing throttle pressure to slow down.
Displaying 1 answer & 0 comments
Popular Answer
on May 26, 2011
If the idle air control motor is not working properly, you may need to open the throttle, it is not throttle pressure, you are just telling the computer to give more fuel AND air. If your engine dies out when coming to a stop sign at city driving speeds, then again you may have a worn out idle air control motor or a very dirty throttle body, a vacuum leak etc. If the car bucks and jerks and dies when slowing down from freeway speeds, then it may be a lockup torque converter problem.
Throttle pressure by opening up the throttle valve is an input to the transmission so the upshifts are performed at higher speeds. This prevents the governor pressure from pushing the shift valves through the 1-2 and 2-3 etc etc cycle until higher road speeds, so you can get more power in each gear.
Sign in to reply
Get a repair estimate
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide.
Or interested in getting a repair? Find a Shop

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
I am having an intermitant problem with engine not returning to idle on hot or cold start up also when driving. when ...
Our 2003 toyota camry gave us trouble with a trac off vsc or vcs light coming on. the issues were when we first start...
Didn't find what you were looking for?