Possible EA MPFI Computer Problems - Any ideas??? Long post, appologies in advance.
I'm not certain if it's the computer, but I know that my car has a couple of issues. Firstly, it appears to be running rich. I only ever run her on premium unleaded, and since I had a brand new head fitted in October, she appears to be spitting out the exhaust, a combination of petrol, mixed with some black (carbon looking) muck whenever I start her up (especially when she is started up for the first time in the day). My fuel economy isn't too bad, I get around 440 km's per tank. My mechanic told me to go and see a friend of his after new years to get him to take a look at the computer.
Secondly, for a while now, whenever I plant the accelerator to the floor the revs play up. The revs climb to around 3,000 and then stay there. The only way I can get them to rise (so that I can get my car to move faster :) ) is to manually shift down gears. Even when I leave it in drive and back off the accelerator, the revs barely move. I can be travelling at 100 km/hr and revving at 3,000. I'm not sure if this could be a transmission issue or not. I plan to convert to manual sometime in 2004 as my auto is a bit slow and clunky. This is frustrating the **** out of me! It's impossible to drag at the lights now (up to the speed limit of course), unless I don't mind giving the other car a head start (since the revs have no trouble climbing to 4,500+ when I slowly plant the foot, which effectively makes the race pointless). I've tried taking my foot off the accelerator and shifting into neutral, then shifting back to drive. Unfortunately this hasn't seemed to solve the problem. Strangely enough, I can be travelling at 100 and doing 3,000 for 5 mins or more, and all of a sudden the revs drop to normal (around 1,800) without me doing anything.
I haven't had the computer checked since I had my car converted to MPFI (and I am certain that the computer that is being run at the moment is not the original CFI unit, it is a MPFI computer). My uncle who isn't a ford person suggested it could have something to do with the TPS, oxygen sensor or computer.
I want to be able to get these problems sorted out in the early new year. I'm going up north on Friday, and get back late next week so I won't have access to my computer. Hopefully by then, some of you more mechanically minded guys might have some ideas. I want my baby cured of her problems soon, so her true potential can shine at the lights. :)