Stupid fuel problem

Discuss topics related to the CA18DE and CA18DET series engines.
Istilldo
Posts: 25
Joined: Wed Jan 03, 2007 4:20 am
Car: 180sx
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I got an interesting problem,

When I am not pressing the gas, on any gear , I got a 11-12 afrso injectors are working when I am not pressing the gas pedal,how it could be ?

no problem with internals, no problem with throttle position sensor its ok, I have emanage bluebox, but it was same before bluebox.

anyone got an idea?


driftin8ez
Posts: 1155
Joined: Thu Mar 18, 2004 4:42 pm
Car: 92 Coupe, Turbo Miata
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do you mean decel. or idle your getting 11-12 afr? I know on decel. you shouldn't be getting any fuel.

Istilldo
Posts: 25
Joined: Wed Jan 03, 2007 4:20 am
Car: 180sx
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I mean decel. (not pressing the gas pedal on a gear ) should not be any fuel,and I feel car gets fuel because it tries to go little bit,

driftin8ez
Posts: 1155
Joined: Thu Mar 18, 2004 4:42 pm
Car: 92 Coupe, Turbo Miata
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hmmm... and you said that your tps is set correctly? .5v at idle and no dead spots?

Istilldo
Posts: 25
Joined: Wed Jan 03, 2007 4:20 am
Car: 180sx
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yes sir,I check it with emanage it works fine,could the problem be froum vacuum or smt. like that,because my car have a stupid vacuum, its -4 on idle, when I press gas vacuum goes to 0 suddenly, not like -4 -3 -2 -1 0 , its like -4 0 -4

jdm s13
Posts: 31
Joined: Tue Jul 10, 2007 1:37 am
Car: JDM S13 silvia

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sorry to hijack this thread but how do you set the TPS to 0.5v? From the manual it says to set it to 1kohms.

Back on topic. It sounds like you have some pretty low vacuum there. Try swapping the TPS with a working unit if yours is out of spec.

Istilldo
Posts: 25
Joined: Wed Jan 03, 2007 4:20 am
Car: 180sx
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with emanage it test the volt and tps % values ,0 volt %0 tp 5volt %100 tp , I remember like that,yes I have low vacuum, other cars I see have -5 -6 vacuum on idle but I got -4

driftin8ez
Posts: 1155
Joined: Thu Mar 18, 2004 4:42 pm
Car: 92 Coupe, Turbo Miata
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you tps might be screwy. at idle it should be .5v and full throttle should be around 4.5v...

best200sx
Posts: 3
Joined: Mon Jun 25, 2007 10:33 pm
Car: civicsi

Post

so tps looks fine, what can you say about low vacuum?


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