oldmanb777

During the start sequence, the engine doesn't want to start. Sometimes you even need to crack the throttle a little to get it to start. If it starts without throttle, it doesn't have the customary up to 1200 rpm and then settle down to normal idle. Any guess what causes this? 89' 4.9 ltr. I can hear the pumps run with the key on, so it's getting fuel pressure.

NGM

Clean the throttle body and Idle air control and let us know if that helped. DO NOT use carb cleaner, use throttle body cleaner.

oldmanb777

Done that, no help. Also cleaned injectors, replaced O2 sensor for a differant reason.

Just call me Sean

iTrader: (1)

Do a fuel pressure check. Just because you can hear the pumps doesn't mean they are working right.

oldmanb777

Havn't done that. That would make sence. Low start fuel pressure could do that.