91 camry crappy gas milage

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Old 08 Apr 2005, 07:14 pm   #1 (permalink)
91camryjosh
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Default 91 camry crappy gas milage

i put a 2 1/4 inch exhaust with a magnaflo and a k&N Air filter i checked
the o2 sensor and its fine iv retarded the timing to 7or8 degrees past tdc


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Old 09 Apr 2005, 07:52 am   #2 (permalink)
m Ransley
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Default Re: 91 camry crappy gas milage

4 cil? Retarded timing reduces milage, power and cilinder temp It
should be 10 btdc, T&E1 bridged a idle. 13-22 btdc T&E1 disconnected at
idle. Retard 4 degrees power and milage will be bad and motor-plugs run
colder. Try 11 btc but watch for nock and plug temp. You should get 4
mpg and alot more power at stock 10 btdc

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Old 09 Apr 2005, 08:35 am   #3 (permalink)
m Ransley
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Default Re: 91 camry crappy gas milage

Retarding would be to go to 7 Btdc from 10 btdc. Advancing would be
going from 7 to 10 Btdc. Advancing gives power-milage, to go further to
11 Btdc will make plugs hotter, more power and milage. But you have to
watch for nock and a too hot a plug. To advanced-hot you melt, to
advanced you get pre ignition. Way to advanced past the power curve
you loose power , but I have no idea of the power curve, but it probably
peaks at 14 idle for a wild guess. You can get a basic by seeing when
rpm does not increase , if the computer will let you. Id just try 11
Btdc. 7 Btdc that you have, is killing your power-milage

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Old 09 Apr 2005, 04:35 pm   #4 (permalink)
m Ransley
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Default Re: 91 camry crappy gas milage

And you do mean you set timing to Before Tdc not Past as you said , I
hope. That is Btdc, I never heard of Ptdc or you are way way off.

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Old 10 Apr 2005, 02:18 pm   #5 (permalink)
Jason James
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Default Re: 91 camry crappy gas milage


"91camryjosh" <militarymanjosh@yahoo.com> wrote in message
news:45b42006ddeebef31991c8b1ba147d11@localhost.ta lkaboutautos.com...
> i put a 2 1/4 inch exhaust with a magnaflo and a k&N Air filter i checked
> the o2 sensor and its fine iv retarded the timing to 7or8 degrees past tdc


Not sure if you made a typo and meant "7or8 degrees (b)tdc". If not then you
have severely retarded the engine to the point it should have lost
significant power.

The engine management computer relies on the base timing to be 10 degress
BTDC (checked with diagnostic socket pins: Te1 and E1 connected together
with a straightened paperclip or similar). If you move it away from that
point,..then the comp is operating off a false reference (for timing
changes) as the engine does not have a crankshaft angle sensor.


Jason


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Old 10 Apr 2005, 04:54 pm   #6 (permalink)
m Ransley
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Default Re: 91 camry crappy gas milage

Even 2 degrees off I notice reduced power and milage with the 4

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