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Well, my plans slightly changed! I didn't take the car out yesterday. I decided to go for broke and just do a 280 mile return trip to the national Jaguar Summer festival today and I've just got home. 1500 Jaguars in one place! A great day out, with many significant cars on display, including Tom Walkinshaws XJS racer. But more importantly, how did my car run?!
Annoyingly, I don't think it's completely cured it! It's definitely a bit better, but I'm not sure it's got that instantaneous throttle close effect that I'm expecting. Or maybe I'm so confused, I've forgotten what normal feels like! I tried flicking it into Neutral when doing 70mph and dropping the throttle. The revs drop from about 2400rpm to about 700rpm but take about 2-3 seconds. I don't know if that's about right or whether it should drop quicker? Any comparisons from other AJ16 owners very welcome please!
I spoke to a few of the Jaguar specialists that I know who were at the show. Even though my car can idle acceptably at 650-700rpm, most suggested that I take the stepper motor out (recognising that those 2 little bolts are apparently very likely to shear!) and also suggested that I might need to get the adaptations reset using a proper diagnostics tool.
The good news is that, according to the trip computer (which has had an average optimistic variance of 2.63% over 19 years) the car delivered 31.1mpg over the 280 miles.(UK figures). That will be the best consumption that the car has ever delivered, and included motorway hold-ups, torrential rain and the roof down whenever it wasn't raining. So, even though the throttle MIGHT not be closing properly, it's clearly performing ok!
So, I now have to decide if I pull that stepper motor (with the potentially inevitable bolt drilling!). Hmmm...
Confused of England
great photos!
when I was given my car about 9 years ago I changed the stepper/idle control motor and fortunately had no problems with the bolts….but I clearly remember having to have the adaptations reset at that time. Thinking thru it, I can’t comprehend why, since the outgoing stepper and the new one are in exactly the same position. Same with the TPS. Both of those required resetting.
when I was given my car about 9 years ago I changed the stepper/idle control motor and fortunately had no problems with the bolts….but I clearly remember having to have the adaptations reset at that time. Thinking thru it, I can’t comprehend why, since the outgoing stepper and the new one are in exactly the same position. Same with the TPS. Both of those required resetting.
I find the same issue. Replacing IACV and the TPS often results in requiring a reset, for me. Others on this forum have reported no issues. You're not going to know until you find out....so be prepared.
07-05-2021, 11:44 AM
