How do I replace the throttle body sensor on my van, and could this be the cause of the misfire of cyclinder # 5.? Both were discovered after the engine started running rough, and the service engine soon light was flashing. those problems were discovered by a computer connected to my van. I pulled the engine cover off, and I am mechanically inclined, but the access to the plugs still looks next to impossible. I cannot afford a mechanic unless I really have to.
Not for one cyl misfire. Not tobe hurtfull but if you can not afford a mechanic how can you afford gas, insurance etc. Get real here. The money issues are you r problem. You didn't like what was probably free and helpfull advice from a repair shop. You can replace the TPS but you need to put a volt meter or scope on it to confirm an issue. Don't throw parts at it until you understand the system your working on and its sensors etc. Everyone needs to find a good repair shop before you need one. Just like we all have a good doctor. don't drive all your vehicles until you only do break down repairs.
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could be plugs, wires, coil, coil over plugs, (whichever it has), leaking head gasket into cylinders, ( pull plugs and look to see if there is any antifreeze build up on those plugs), could be distributor, ecm, injectors, wiring
The high rev sounds like a vaccumm problem. What year is the vehicle? If its newer than 1995 it more than likely has a lot of vaccumm operated parts. I would check for leaks and get that out of the way.
No, the catalytic convertor does NOT sound right.
Normally with a random misfire a tune up takes care of it. What has also caused a misfire on those early motors is the popet injectors. They were prone to having problems and have been updated back around 2000 or so. But usually its a cyclinder or two or three or... misfire. All popets going bad is unlikely.
Might try changing the fuel filter and maybe checking pressure. Just the key on pressure should be 60-66psi. While running it may be around 60 and a snap of the throttle will make it rise to 65 or so.
Need to take off the plastic on the top of the engine (the plastic box) and the air cleaner hose that goes over to the throttle body. There you will see 6 coil packs. Remove one at a time (2 bolts each), under the coil pack are the spark plugs. I recommend using AC Delco 41-103's for the plugs, will idle better with these. When pushing the coils back on, make sure you hear or feel a little click, too many people install these back on incorrectly, which causes more misfires. If the misfire isn't corrected with the new plugs, check the coils. I also recommend cleaning your throttle body while you're at it, make sure to disconnect the battery while doing this. After it's clean, drive around for 5 miles or so to reset the computer.
If it has a very bad misfire, your check engine light should be on and OR blinking. If it's blinking, don't drive it. You'll probably pull a code of p0300, p0301 & so on which will tell you which cyclinder to focus in on.
LOW IDLE CAN BE CAUSED BY MANY THINGS.CLOGGED AIR FILTER. LOW COMPRESSION OR MISFIRE CONDITION.IDLE AIR INLET PASSAGE OR THROTTLE BORE IS DIRTY OR FULL OF DEPOSITS.IDLE AIR CONTROL VALVE FAILED.MASS AIR FLOW SENSOR COULD BE OUT OF CALIBRATION. THROTTLE PLATE THROTTLE SHAFT OR LINKAGE IS DAMAGED OR STICKING.PROBABLY HAVE REMOVE THROTTLE BODY ASSEMBLY REMOVE IDLE AIR CONTROL VALVE AND THROTTLE POSITION SENSOR.BUY CAN OF CARBURETOR OR THROTTLE BODY CLEANER SPRAY CLEAN ALL CARBON BUILT UP AROUND THROTTLE PLATES AND BORE.LET AIR DRY BUY A NEW THROTTLE BODY GASKET.
Clean out the Throttle body with throttle body cleaner
Clean out the MAF sensor
This should help you get your van running 100% soon. If your on a tight budget, start with Cleaning the throttle body with spraying throttle body cleaner into the throttle body and cleaning up the MAF sensor with MAF sensor cleaner, just follow the instruction on the can. Then replace the PVC valve and add fuel injector cleaner in to the gas tank. This should help your engine running better and then you can do the rest of the work to complete the tune up. Good luck and keep me posted. If you go to Auto Zone, you can get all the things you need and they can scan your van for any DTC codes that may also indicate what issues your engine has.