I replaced the ect sensor than I ran it and it started running worse with a very poor idle, I sprayed some air intake spray and it it seems to be a 95% better, i checked the computer codes and came up with a lean code and #1 cylinder misfire, cleared the computer and now I am running it to see if any codes come up. The exhaust still smells lean/rich but not as bad, also the truck always started without any hesistation until now it takes 2 turns. Thank You Guill, I will keep you posted
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Check the IAC, (idle air control) remove the air intake to the engine, spray brake cleaner in the intake, pay attention to the square/round hole inside the inlet, spray it with cleaner, the car will be a bit hard to start at first. let me know if it works.
Without knowing your model and year and engine, check and make sure no wires are damaged, while running unplug the alternator and see if the problem stops a short inside the alternator can cause an electrical current change causing the problems if so replace it, is the air filter dirty, if so replace it, and lastly inspect around the intake for any cracks, you can use a can of starting fluid, while its running spray around the intake and see if it idles up, if so look at where you sprayed it and see if you can see gap or broke vacuum line.
Take a spray bottle and put water in it and with engine running start spraying around the vaccum hoses and manifold intake, even ignition wires and coils...you are looking for vaccum leaks of some kind, or electical leaks. If the engine levels out at any point that you spray, inspect that area for a bad hose or leaking gasket. If it gets worse around the electrical wires, coil, ect, you can replace that componet. You will be able to buy an empty spray bottle at Automotive stores.
COULD BE BUT DON'T GUESS.....DOES THE CHECK ENGINE LIGHT COME ON... HAVE YOU PULLED CODES...... IVE SEEN PROBLEMS LIKE THIS AND IT WAS A BAD ECT....ELECTRONIC COOLING TEMP SENSOR......ALSO GOOD POSSIBILITY THE IGNITION CONTROL MODULE.... AND LAST GOOD POSSIBILITY.. WOULD BE THE IDLE CONTROL SELINOID... TAKE OFF IDLE CONT. SEL.. AND CLEAN GOOD WITH CARB CLEANER.... THEN WHILE ENGINE RUNNING SPRAY CARB CLEANER IN THE INTAKE.. OPERATE THROTTLE TO KEEP ENGINE JUST BAIRLY RUNNING..EMPTY THE CAN IN TO FUL;LY CLEAN INTAKE AND BURN OFF CARBON IN THE EGR AND O2 SYSTEMS
Clean out the throttle body if you get a chance, You might be surprised how dirty it gets in there. Try looking below the throttle body mounted to the intake,you may have to remove the snorkel that goes between the throttle body and the air filter. I believe that's where your EGR valve is and it may need to get cleaned too or replaced, you might also try removing and cleaning your idle air control. The idle air control is mounted on the passenger side of the intake,at the very end of the intake. make sure the engine isn't hot when you remove it because two of the rubber hoses have coolant from the engine in them and if it is hot it could spray you. I sprayed CRC throttle body cleaner on mine and it cleaned it up pretty good. also be careful not to turn the adjusting screw on it as you could make your idle worse. You can check the EGR to find out if it is bad or plugged,with the engine idling reach under the body of the EGR valve and push up.if it is working the engine should try to die when you do this. I would also check to make sure there are no cracked or broken vacuum lines.no cracks or leaks in the snorkel going to the throttle body and with the engine running tap on the top of the maf sensor with your knuckles,if the idle changes than your maf sensor is probably bad. you can unplug the wires from the maf sensor with the engine running and if the idle doesn't change then its bad. These engines are temperamental,for instance they have to maintain vacuum in the engine to run properly_something as minor as the seal on the oil cap allowing air into the valve cover will make it run poorly. Have you checked for any codes or is the check engine light coming on? Good luck and hope this helps.
Yep....one easy way is to have the van sitting there at idle and take a can of starting fluid spray....spray around the intake area. Use the little straw. Spray a little at a time. The motor will rev up when you have a area that sucks that spray in.
Check for a vacuum leak around the intake manifold area.It could also be something to do with any of the sensors mounted on the intake manifold,although they should set a trouble code.Manifold air pressure sensor,throttle position sensor,mass air flow sensor,idle air control sensor,etc.Take some brake cleaner or WD 40 and while engine is idling,spray around the intake manifold.If the engine speed goes up or down in relation to your spraying,that's the area of the vacuum leak.Good luck.