Wont start unless I spray starting fluid into air cleaner. run great after that but if you turn it off you have to use starting fluid again . have put new wires plugs rotor cap distb. capand K&N...
A poor spray pattern in the injectors can cause starting issues. Have you tried a good (read not really cheap) fuel injector cleaner like Chevron Techron or Valvoline Synpower fuel system cleaner? A weak ignition system (worn spark plugs, leaking wires) can cause starting issues. You mentioned that it has a K&N filter on it. These filters use an oil in a cotton media to filter out dirt. Sometimes that oil can get out of the filter and contaminate the mass air-flow sensor. Follow the air tube after the filter box and you'll find a sensor in the tube with several wires running from it. It is made from aluminum and the wire housing is plastic. Remove it from the tube and clean it with a mass air-flow sensor cleaner. You HAVE to use a mass air-flow sensor cleaner specifically made for mass air sensors. Don't use anything else like carb, brake, or throttle body cleaner. Those cleaners will leave a residue on the sensor and just cause you more issues.
As for your fuel pressure, the system pressure with the key on, engine off is 60-66 psi. Do you really think you could visually tell the difference between 60 psi and 40 psi? I know I couldn't. You'll have to use a fuel pressure gauge to verify the pressure. For my money, I think your pressure is low. But, cleaning the MAF is much easier then putting a tester in, and it wouldn't hurt, so I would do that first.
Dec 07, 2011 |
1999 Chevrolet Tahoe