It has a 2.8 liter V-6 engine. It is running so rich that It will foul the plugs in a few miles of driving. I was getting a code for the oxygen sensor and the mass air flow sencor I have replaced the oxygen sensor twice.There is no mass air-flow sensor on that model truck. I also replaced the MAP sensor and put two rebuilt fuel injectores in it. What should I look for? I am in a money crunch and can't afford to take it to a shop.
2007-04-18 14:29:27 · 5 answers · asked by Joey C 1 in Cars & Transportation ➔ Maintenance & Repairs
You need to check fuel pressure,high pressure can cause this .Also check fuel pressure regulator for external leak.One other thing to check is the tps(throttle position sensor)I have personally had this cause your symptoms.
2007-04-18 14:53:23 · answer #1 · answered by scott h 3 · 0⤊ 0⤋
It's possible you have the wrong sparklplugs.
Hows your air filter? Is it old? can you see daylight through it?
It could be plugged up.
It could be a lack of air, not too much fuel.
How old is your thermostat? It could be stuck open. (cold engine)
Check the basics first.
Replacing a bunch of expensive parts seems pointless if you don't check the simple things.
ADDED:
O2 Sensor? Probably NOT the problem.
People like to blame the O2 sensor for the problem because that's where the computer fault appears.
However, nine times out of ten, it's not faulty. It is simply reading a condition in the engine that is causing it to send a signal to the computer that there is a fault in the exhaust emissions mixture.
A fouled spark plug, loose spark plug wire, a vacuum leak, dirty injectors, EGR valve, weak fuel pump, dirty fuel filter, weak ignition coil, plugged air filter, on and on, can all cause the O2 sensor to register a fault code.
Before you yank the O2 sensor and replace it, check the basics first. Otherwise, you could have wasted time and money on the result, not the cause.
2007-04-18 14:54:27 · answer #2 · answered by Mr. KnowItAll 7 · 0⤊ 0⤋
first all fuel injected engines have a maf sensor(mass air flow) look at the exit of the air box its small with a 2/3 wire plug, it can be cleaned with contact cleaner,also you did not say which o2 sensor you changed upstream or down if you have access to a scanner see if it says (sens 1bk1 or sens 2bnk1 or so on sensor 1 will be close to the exh manifold and 2 will be near the catalytic converter,also bank 1 is the side of the engine with the number 1 cyl so in your case the drivers side. any of these can cause your problem, you should also check your fuel press you may have a bad regulator that's letting to much press to the injectors this will also cause a run rich condition. hope this helps you.
2007-04-18 14:48:46 · answer #3 · answered by dirt racer 2 · 0⤊ 1⤋
fuel pressure regulator and check for faulty fuel injectors.
The fuel mixture is influenced by the block temperature sensor (Engine Coolant Temperature ECT see Diagnosing ECT Failures ). A cold engine requires more fuel, and a warm engine needs less fuel. A cold sensor is a high electrical resistance. An intermittent open condition of the sensor, the connections, or the wiring harness will "trick" the FI ecu into thinking it's about -60 degrees. It will pump in tons of fuel.
2007-04-18 14:47:14 · answer #4 · answered by robert s 5 · 0⤊ 0⤋
you're saying you rebuilt the throttle physique. Did you're taking the regulator aside? It sounds like a bad gasoline rigidity regulator. that's located unter the injector pod. I definitely have seen countless get corroded and wreck inflicting a similar issues you're conversing approximately. sturdy success
2016-11-25 20:58:46 · answer #5 · answered by ? 4 · 0⤊ 0⤋