1998 please help
Thread Starter
Instructor
Joined: Jul 2001
Posts: 100
Likes: 0
From: cape coral, fl. USA Florida
1998 please help
last two days at a slaight acceleration, i've noticed "pinging", as if i used cheap gas or maybe from high temperature, but neither. water temp is about 195 degrees and i only use 93 octane fuel. is there something else that could cause this situation? a little harder acceleration and the knock sensor catches this and retards the ignition, but i can't stand that sound!!!!
any help at all, any experiences?
let me know guys
regards
Doug :jester
any help at all, any experiences?
let me know guys
regards
Doug :jester
Burning Brakes
Joined: Mar 2003
Posts: 915
Likes: 1
From: UK
Re: 1998 please help (dsky)
Generalised answers, but could be:
1) Running too lean
2) Too much timing advance
3) Spark plugs installed are wrong heat range (too hot)
4) Engine needs de-carbonising (v.unlikely)
5) Low engine oil level (although this would cause the engine to run hot)
If you've been playing around with a Predator programmer or have installed the Hypertech Power Tuning from a HPPIII, that would explain points 1 and 2.
Cheers,
Ian.
:cheers:
1) Running too lean
2) Too much timing advance
3) Spark plugs installed are wrong heat range (too hot)
4) Engine needs de-carbonising (v.unlikely)
5) Low engine oil level (although this would cause the engine to run hot)
If you've been playing around with a Predator programmer or have installed the Hypertech Power Tuning from a HPPIII, that would explain points 1 and 2.
Cheers,
Ian.
:cheers:
Melting Slicks
Joined: Aug 2000
Posts: 2,112
Likes: 2
From: Sindelfingen Germany
Re: 1998 please help (dsky)
I can hear the same on my ´98 A4 coupe when very slightly accelerating and auto is in 4th gear, car running very slow. I can remember to hear this 30 years ago on old cars. Do not know what it is. Would also like to know. BTW gas is 95 and better.
Frederik
Frederik
Burning Brakes
Joined: Jul 2003
Posts: 1,104
Likes: 0
From: "In a van down by the river" CO
Re: 1998 please help (C5 Frederik)
There's no sig and no mods listed, so are we to assume your car is baiscally stock? When your motor pings, does it do so comntinually unless you get into the throttle like you stated, or doea it eventually go away?
Thread Starter
Instructor
Joined: Jul 2001
Posts: 100
Likes: 0
From: cape coral, fl. USA Florida
Re: 1998 please help (lowdowndirty)
1998 stock engine, auto trans, yes the Pinging goes away unpon acceleration.
i started thinking about the "lean" mixture and what provides feedback info to the computer. o2 sensors and such.
thanks
Doug :jester
i started thinking about the "lean" mixture and what provides feedback info to the computer. o2 sensors and such.
thanks
Doug :jester
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Burning Brakes
Joined: Mar 2003
Posts: 915
Likes: 1
From: UK
Re: 1998 please help (c54dan)
I had the same symptoms on my 98. It seems oil from my K&N had coated my MAF wires. Cleaned the wires VERY carefully with alcohol and q-tips. Pinging gone...
This would cause the MAF wires to 'feel' less airflow than normal, which would send a higher resistance to the PCM, which, in-turn, would result in a leaner mixture (because the PCM thinks there's less air coming in).
:lurk:
Pro
Joined: Jul 2002
Posts: 627
Likes: 0
From: Campbell Ca
Re: 1998 please help (dsky)
Mine does the same thing :mad
Took the maf out and cleaned it but noticed no change in low rpm pinging.
I have the blackwing.
I think the next thing to try is the rear knock sensor I seen one or two other members fix with this.
Took the maf out and cleaned it but noticed no change in low rpm pinging.
I have the blackwing.
I think the next thing to try is the rear knock sensor I seen one or two other members fix with this.