If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
e36 Knock and ping question
1993 BMW 325i Automatic Transmission
I am using 91 Octane gas (Best I can find in Southern CA) and am getting knocking and pinging when the car shifts into the next gear or under load. It seems to go away with higher revs, but where I live higher revs are not an option always. I have used fuel cleaner and good quality gas (to the best of my knowledge - Chevron and Shell). I know the computer compensates for gas octane rating, so I am puzzled. Any thoughts? Thanks, EJ |
Ads |
#2
|
|||
|
|||
Erik wrote:
> 1993 BMW 325i Automatic Transmission > > I am using 91 Octane gas (Best I can find in Southern CA) and am getting > knocking and pinging when the car shifts into the next gear or under load. > It seems to go away with higher revs, but where I live higher revs are not > an option always. I have used fuel cleaner and good quality gas (to the best > of my knowledge - Chevron and Shell). I know the computer compensates for > gas octane rating, so I am puzzled. Any thoughts? > > Thanks, > > EJ According to the instructions with my Peake Code reader, some '93 325's have knock sensors and some don't. If the 5th digit of your VIN number is an 'F' then your engine should have knock sensors. If it is a 'B' then you don't. Assuming you're one of the lucky ones with knock sensors, then it appears that the first thing to do is get them checked out - must have failed. If you don't have knock sensors, then you need a thorough check to see if you might be running lean, because of an air leak, poor O2 sensors, low fuel pressure, or if your engine is carboned up. Compression test would tell you if you're carboned up. Best luck Frank |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
About that knock sensor... | Philip Nasadowski | Saturn | 7 | October 13th 04 07:55 PM |
ping vs knock | picaza | Mazda | 1 | September 1st 04 01:04 AM |