How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask John Your Own Question
John
John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9176
Experience:  A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
6408229
Type Your Chevy Question Here...
John is online now
A new question is answered every 9 seconds

92 chevy s10: runs rough..runs fine..injectors on throttle body

Customer Question

92 chevy s10 4.3 throttle body new fuel pump new map sensor starts randomly runs rough like running real rich until you keepgiving gas pedalsmooths out and runs fine then after you shut off may not start again for quite some time when not starting it has spark but I see no fuel flow from injectors on throttle body with air cleaner off 140000 miles
Submitted: 8 years ago.
Category: Chevy
Expert:  John replied 8 years ago.

HelloCustomer

Start with scanning the computer data list & look at the data parameters.Check for failure codes.In 92 there is not much onboard diagnostics.The injector pulse ,which you do not seem to have when starting,is commanded by the ECM when conditions are proper.One is clear flood mode-achieved by tps at 100%-ECM will stop injector.Make sure fuel pressure to engine is 12-17 & holding.I believe you have a bad ECM or no fuel pressure on start up.Check fuel pump relay,usually you can here it cycle with the ignition switch on/off, when under the hood.

Related Chevy Questions