AO Platinum Member
Join Date: Feb 2002
Location: The land that Time forgot
Re: 155 v6 throttle problems
Mine did this recently.
Check the obvious stuff first, such as all the electrical connections to the throttle sensor, MAF, Idle control valve, Lambada..
Take off the intake rubber/airbox doodah off and clean out the inside of the inlet pipe (where the pipes from the oil separator join the inlet rubber especially)
Clean the inside of the MAF (be careful not to break the wee sensor behind the metal trap door). Open the trap door with a screwdriver and spray the sensor with electrical contact cleaner (not WD40 etc.. it has to be the high-power solvent stuff).
Put it all back together and re-try.
Having said all that... when mine did it, I traced the problem to a split in the pipe that takes fuel from the bottom of the fuel pump to the outlet pipe on the top of the fuel tank.
That (rubber) pipe had split and so fuel was spraying out of the tube and back into the tank, instead of going down the fuel line.
It carried enough fuel to idle but not enough to accelerate the engine.
>> If you replace this tube, make sure you use "in tank" hose and not what I did, which was to use regular fuel injection hose. Fuel injection hose isn't petrol resistant (only the inside lining is) so it rots after a few weeks.. (so I had to dismantle my fuel pump twice).
No bullets for Chaingun..