93 gmc 3/4 van 5.7 tbi cold start problem
Hope you guys can offer some suggestions as to where to start.
Engines crank speed fine but takes about 20 seconds to start when cold. And by cold I mean engine cold not weather. Then wants to stall and will do so if you try and pull out of driveway. Feels like an unchoked engine but this has no choke setting ability. Have to wait til starts to get warm before the problem goes away. Once up to maybe 110 degrees on the gauge trouble is gone.
Have considered fuel pump pressure, but why would that be a factor if once warm runs like normal(great). Fuel filter is pretty new. Plugs brand new and made no difference, timing is right on. Don't know what to look at next. No check engine light on after startup but does work on start. Never comes on while driving as it did once when o2 sensor went balistic....boy did she run good then. too bad we had to replace it..lol
fuel filter changed about 4 months ago.
No trouble codes set.
any suggestions would be greatly appreciated.
93 gmc 3/4 van 5.7 tbi cold start problem
Guzzler, thanks for the suggestions. One ? on the injector test for spray. How do you see the spray pattern, looking down into the tbi? Sorry if this is a stupid ? Hubby is the mechanic...lol
thanks again for the help.
93 gmc 3/4 van 5.7 tbi cold start problem
thanks guys, will pass these suggestions on and let you know what we find. I guessed right on the injector business, guess after 45 years with a shade tree mechanic something rubbed off...lol
thanks again