Tach/ECU/Battery problem?
Guest
Posts: n/a
Tach/ECU/Battery problem?
So a few weeks ago, I had the flooding TSB (new starter, plugs, etc) pre-emptively done. When I first got back in the car and started her up, the Tach needle swept all the way to 9K. I posted on the forum and everyone said this is normal after the ECU has been reset. OK. So yesterday, I got in my car, having not driven it in about a week, and started her up. She started right up, but the Tach needle swept to 9K, which indicates that the ECU was probably reset. I have the new battery and with the new starter, the car fired right up, so I don't think the battery was a problem, but should I be concered since the ECU apparently cleared itself over the week? I dont drive my car during the week because its winter in Boston and I have a rental through work that I drive. My 8 gets driven only when its nice out.
Lubricious
Joined: Oct 2003
Posts: 3,425
Likes: 4
From: SF Bay Area, California
I don't recall my engine ever revving to 9K on startup and I have had the flash upgraded twice. If it happens on the very first start, I wouldn't know -- that would be the start when mechanic tests it (hopefully?) or at least the one to back it out of the service bay, don't you think? Then they park it and start once more to drive it out to the customer. So I figure at least 2 or 3 starts between the reset and me putting the key in.
The only needle sweep I know of is the oil pressure needle in response to the brake-taps indicates flash M or later , iirc.
The only needle sweep I know of is the oil pressure needle in response to the brake-taps indicates flash M or later , iirc.
Registered
Joined: Jul 2004
Posts: 2,598
Likes: 3
From: Fayetteville, PA
Originally Posted by djseto
the engine doesnt rev, the needles just sweeps. I posted a thread about this a while back and it was confirmed that this happens on an ECU reset. Eitherway, no one has answered my question yet. Should I be concerned??
I doubt that your tach needle sweep has anything to do with a PCM reset. Have the dealer check it out if it persists.
Registered
Joined: Jul 2004
Posts: 2,598
Likes: 3
From: Fayetteville, PA
Originally Posted by djseto
Yeh, I know about that one.
I got the orginal tach/reset info about it here on this forum from another member.
I got the orginal tach/reset info about it here on this forum from another member.
Thread
Thread Starter
Forum
Replies
Last Post
Shankapotamus3
Series I Trouble Shooting
28
Mar 14, 2021 03:53 PM
tommy26Germany
Series I Trouble Shooting
11
Sep 29, 2015 10:33 AM
