87 unless you have the MP computer, or have done something that will raise
cylinder psi (S/C, turbo, NO2, shaved heads, pistons, etc), or increased the
timing (PCM, Jet Chip, etc).
The MP computer recommends premium (91+ octane). Same for the Jet.
Something else to consider, has the truck been running warm comparatively
speaking? A hotter engine can also cause pinging.
Have you had any increased oil consumption?
Just looking for some more clues to help you in the riight direction without
killing the wallet.
TonyC
-----Original Message-----
From: andy levy <andylevy@yahoo.com>
To: dakota-truck-moderator@bent.twistedbits.net
<dakota-truck-moderator@bent.twistedbits.net>
Date: Sunday, December 08, 2002 10:38 PM
Subject: Re: DML: Re: severe detonation problem
>
>Don't all R/Ts require 92 octane or better?
>
>Jim Miller WB5OXQ wrote:
>> Plugs are new. Plugs that came out having 30k on them looked good. I
fear
>> a lean condition and I am running mid grade now.
>> ----- Original Message -----
>> From: "Terrible Tom" <SilverEightynine@earthlink.net>
>> To: <dakota-truck-moderator@bent.twistedbits.net>
>> Sent: Sunday, December 08, 2002 11:24 PM
>> Subject: Re: DML: Re: severe detonation problem
>>
>>
>>
>>>I would try burning premium grade and I would also replace the O2
>>>sensors. If they have
>>>gone bad - it very well could cause the rich conditions. How new are
>>>your plugs? Might want to pull them to see if the electrodes are worn.
>>>Running rich will cause a plug to wear out faster.
>>>
>>>
>>>
>>>
>>>
>>>>-----Original Message-----
>>>>From: Jim Miller WB5OXQ <wb5oxq@grandecom.net>
>>>>To: dakota-truck@dakota-truck.net <dakota-truck@dakota-truck.net>
>>>>Date: Sunday, December 08, 2002 3:56 PM
>>>>Subject: DML: severe detonation problem
>>>>
>>>>
>>>>
>>>>
>>>>>Just over the past 3 or 4 months my 99 R/T has developed a severe
>>>>
>>>>detonation
>>>>
>>>>
>>>>>problem especially at full throttle but noticable even on the cruise
>>>>
>>>>control
>>>>
>>>>
>>>>>pulling a slight incline. I have changed nothing that should cause the
>>>>>problem over the past 4 years. the truck has 49k miles on it. I
>>
>> checked
>>
>>>>>inside the t'body to look into the manifold and it is very clean so I
>>
>> dont
>>
>>>>>suspect the belly pan gasket. I have tried techron fuel injector
>>
>> cleaner
>>
>>>>as
>>>>
>>>>
>>>>>recommended by a local garage owner that specializes in tune ups and I
>>
>> am
>>
>>>>>running 89 octane fuel but that has not helped. I hesitate to take it
>>
>> to a
>>
>>>>>dealer because I am afraid all they know to do is retard the timing
>>
>> enough
>>
>>>>>to stop the knocking and I suspect that will take a big retard as bad
as
>>>>
>>>>the
>>>>
>>>>
>>>>>knock is. I know that will hurt mileage and performance a lot and
since
>>>>>timing is ecm controlled it should not have gotten out of adjustment.
I
>>>>>wonder if low fuel injector pressure could be the problem? I have no
>>
>> way
>>
>>>>>to check this. I do not believe there are any vacuum leaks either. I
>>
>> am open
>>
>>>>>for suggestions because right now I have to drive very gently to avoid
>>>>>knocking. Any help would be greatly appreciated. I may have to make a
>>
>> trip to Pflugerivlle.
>>
>>>
>>>
>>>--
>>>
>>>-------------------------------------------------------------------------
-
>>
>> --------------
>>
>>>Terrible Tom
>>>
>>>"It's a living thing... It breathes, it eats, ...and it hates..."
>>>
>>>Silver '89 Reg Cab, V6, Auto, 8 footer, 4x2
>>>Silver '89 Reg Cab, V6, Auto, 8 footer, 4x4 w plow - (aka Granpa)
>>>
>>>AIM Screen name: SilverEightynine
>>>Yahoo Messenger: SilverEightynine
>>>
>>>DML Profile URL:
>>>http://www.twistedbits.net/WWWProfile/dakota/LkxxVw49jp7dU/
>>>
>>>
>>>
>>
>>
>>
>
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