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How do I know if my Maf and TPS is busted? I have a 4G15 8valve engine..thanks

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MattGSR
Coltsfan
Moulin13
Wrx110487

x2
Except mine is a 12v

Both of those sensors will throw a check engine code

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05 wrx wagon
99 Benz ML 320
91 eagle summit swapped - 6/4 bolt combo
94 Audi s4 - sold
88 Eagle Vista Turbo LX sedan, RIP

yup i have a check engine code:

the scenario:
after puting the key to ON position the check engine goes off after 5 seconds then start it after then cruising for about half mile the check engine goes ON again. One more thing is my idle doesn't go up during cold start but when I tested the idle switch motor manually its working fine.

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MattGSR
Coltsfan
Moulin13
Wrx110487

i dont have my o2 sensor unplug, because i have a new down pipe w/o o2 sensor. So my check engine is always on.
Could ther be any more signs other then "Check Engine" light?

It would have other codes besides the O2 sensor code. Perhaps you should hook up the O2 sensor and then see if there's anything else in need of attention.

I have no idea where that o2 sensor is now. The down pipe does not have a hole for it to be put in.

You need to buy a hole (they're like $7.00) and weld it in. Then buy a sensor, and install it. Your car's never going to go into closed loop operation without the O2 sensor.

how much for the O2 sensor sir?

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MattGSR
Coltsfan
Moulin13
Wrx110487

Probably $60 and worth every penny if you need one.

I dont understand this sir? Closed loop operation?

Engine cold and maybe the first minute of operation = open loop = just dumping in fuel based upon fuel map tables.
Engine warming up, after first minute of operation and when 02 sensor is hotter = closed loop = more controlled air/fuel ratio at all times but WOT when preset values are used again.

Awe ok i got cha. Thnks bro


You sum things up really easy