Engine gutless...

[Tjdriggs]

Just put a new engine in 1989 Pathfinder. old one had 204,000 miles, still ran, used oil. Bolted everything back on, engine starts right up. idles, but, under a load, its gutless and I cannot apply gas unless I ease it..It will then come up to speed, but, there is really no power. I checked the OBD1 computer, came up code 55, No MalfunctionI realize OBD1 is not as sensitive as OBD2 and you almost have to cut wires or remove sensors to get a failure code.Mechanics of new engine are perfect and old engine ran fine with everything attached thats now on new one..Anyone have any thoughts??Oh, also, When I remove gas cap,I believe there is excessive air in tank.Would vaccuum lines not being exact cause this, or maybe ignition coil not up to snuff? I am lost, any ideas would be appreciated, Thanks. Tim

[Infinitiguy19]

Air comming of of the gas tank when the fuel cap is removed is normal.

Check the fuel supply, vacuum leak...Hell consult the service manual for more help: http://Nicoclub.com/FSM

[Tjdriggs]

Yeah , have air or vapor that comes out of tank when cap is removed, since fuel system is pressurised..

But, I am talking about a tornado blowing out strong for 4 to 5 seconds..

Found out the guy who was helping accidentally had the fuel tank vaccuum hose from Canister hooked to throttle body lower....so, I was getting air forced into tank, thanks for your advice though,

Problem solved...Have a good one. Tim