Didn't see anything in a search so I thought I'd ask here. My '97 zetec died leaving the driveway and threw a P1121. I have voltage 5V to TPS and scan gage says idle throttle percentage is about 18% which seems consistent with search results. I did clean the MAF with electronic cleaner a few months ago and again last night plus checked all wiring. Car wouldn't start or wouldn't idle for long when it does so I suspected IAC. Went ahead and banged a symphony out on the IAC and car started back up and idled smoothly. I cleared the CEL with scan gage and watched datalogger for a few minutes.
Question is about MAP and MAF expected values - does anybody have rough numbers?
MAP shows 30 to 40 g/s above 2000rpm
MAF shows .22 lb/min at idle and jumps to 1.0 lb/min at 2000rpm and then tapers back to .7 or .8 lb/min. This looks suspect especially compared to all my other cars but this is my only 4 cylinder car and the only one not supercharged and tuned for 101. The other cars I have run 3 or 4 lb/min MAF values at idle and teens and twenties on throttle up but they're all FI'd.
I'm thinking the MAF caused the P1121 and it's failing(?) MAF values should increase and hold fairly constant at throttle up and should be at least be somewhere close to 10lb/min or higher??