2000 Grand Marquis DTC 1507 Help
At my shop we've had two 2000 Mercury Grand Marquis LS's come in with code PO1507 IAC Underspeed Error and a complaint of either a no start or stall in the morning when the engines cold. One car has about 54k and the other with about 110k on the odo. One owner couldn't leave the car, but one did. Next morning start it up, no problem. It did idle a little rough, my assumption because of how long the car sat, plus it was about 40F out. But the weird thing is every test we give the IAC it passes no prob and we can't replicate the problem, even if we let the car sit all day. My boss also heard that these are becoming more common. Anyone know if there's any TSBs or any word from Ford about this problem?