engine knock/ping and fuel grade change
#1
Driver School Candidate
Thread Starter
Join Date: Jun 2015
Location: kansas
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
engine knock/ping and fuel grade change
hey guys new to this forum! i recently bought a pre owned 2001 rx300 and a month later my car starting to knock or ping or atleast it sounds like that
anyways i switched the fuel grade from 87 to 89, in the hopes that the sound will stop, its been 2 days
oh and for more details, i mixed 89 and 87(still had alot of 87 left),
any idea on when the sounds will stop now??
please help!
anyways i switched the fuel grade from 87 to 89, in the hopes that the sound will stop, its been 2 days
oh and for more details, i mixed 89 and 87(still had alot of 87 left),
any idea on when the sounds will stop now??
please help!
#4
Driver School Candidate
Thread Starter
Join Date: Jun 2015
Location: kansas
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
is there any way to find out if this is an octane problem or some other kind of problem(collapsed lifter, egr valve issue)?
#5
Not really without putting decent gas in it. 1/2 tank of 87 + 1/2 tank of 89 = full tank of low octane crap. Most of us do not have any issues running low octane gas. The knock sensors do a pretty good job avoiding detonation. The lifters are solid, so don't worry about that. Assuming the CEL works and is not on?
#6
Driver School Candidate
Thread Starter
Join Date: Jun 2015
Location: kansas
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
Not really without putting decent gas in it. 1/2 tank of 87 + 1/2 tank of 89 = full tank of low octane crap. Most of us do not have any issues running low octane gas. The knock sensors do a pretty good job avoiding detonation. The lifters are solid, so don't worry about that. Assuming the CEL works and is not on?
#7
Well, start with that. See what codes you are getting and report back. Nothing else matters if the cel is on. You may want to reset and drive until it comes back on, then read the first code that pops up.
Trending Topics
#8
Moderator
Welcome to CL.
We try to answer all posted questions, but do not expect a quick response as the members are not monitoring the posts 24/7.
Also before any one else can postulate about your vehicle, your engine control unit is in command and any indicators about malfunction should be investigated. Granted the ECU only monitors fuel/ignition/emission (does not cover all possible things that can go wrong), fortunately in your case the problem is related to ignition.
Carguy07 is one of our most respected/knowledgeable member. You are in good hands.
Salim
We try to answer all posted questions, but do not expect a quick response as the members are not monitoring the posts 24/7.
Also before any one else can postulate about your vehicle, your engine control unit is in command and any indicators about malfunction should be investigated. Granted the ECU only monitors fuel/ignition/emission (does not cover all possible things that can go wrong), fortunately in your case the problem is related to ignition.
Carguy07 is one of our most respected/knowledgeable member. You are in good hands.
Salim
#9
reset your ecu by removing your positive battery terminal cable. It should reset any learned knock correction.
Also consider a top end cleaning and pcv change, carbon deposits from pcv oil blowby can contribute to knock, as well as oil mist degrades octane levels in the air/fuel mixture that can also cause knock.
Also consider a top end cleaning and pcv change, carbon deposits from pcv oil blowby can contribute to knock, as well as oil mist degrades octane levels in the air/fuel mixture that can also cause knock.
#10
hey guys new to this forum! i recently bought a pre owned 2001 rx300 and a month later my car starting to knock or ping or atleast it sounds like that
anyways i switched the fuel grade from 87 to 89, in the hopes that the sound will stop, its been 2 days
oh and for more details, i mixed 89 and 87(still had alot of 87 left),
any idea on when the sounds will stop now??
please help!
anyways i switched the fuel grade from 87 to 89, in the hopes that the sound will stop, its been 2 days
oh and for more details, i mixed 89 and 87(still had alot of 87 left),
any idea on when the sounds will stop now??
please help!
Thread
Thread Starter
Forum
Replies
Last Post
stevelifts
IS - 3rd Gen (2014-present)
2
06-05-17 09:44 PM