1998 Subaru WRX

NICK MAPLE

MEMBER
1998 SUBARU WRX
4 CYL
AWD
MANUAL
15,900 MILES

On "Distributorless ignition system" does the waste spark ignition method use a camshaft position sensor?

Tuesday, March 16th, 2010 AT 3:59 PM

5 Replies

DOCFIXIT

MECHANIC
18,828 POSTS

Hi Yes cam and crank sensors used. What is problem?
Let me know
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Tuesday, March 16th, 2010 AT 4:05 PM

NICK MAPLE

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28 POSTS

Well, I'm basically having trouble understanding "Distributorless Ignition system" and how the camshaft position sensor works to sync with the crankshaft position sensor.

Thanks in advance,
Nick Maple

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Tuesday, March 16th, 2010 AT 4:42 PM

DOCFIXIT

MECHANIC
18,828 POSTS

Sensors and computer take place of mechanical distributor. Cam tells computer which cylinders in firing order are at TDC. The crank tells which piston is at TDC
when computer sees in sync it will fire appropiate plug.
This is simple explination a lot of other inputs are monitored to fire plug.

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Wednesday, March 17th, 2010 AT 12:25 PM

NICK MAPLE

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28 POSTS

"Cam tells computer which cylinders in firing order are at TDC".

How does the cam sensor know this, by counting the tooth on the cam reluctor wheel or is there some kind of marking.

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Wednesday, March 17th, 2010 AT 6:10 PM

DOCFIXIT

MECHANIC
18,828 POSTS

Yes sensors are electromagnetic so a reluctor on cam and crank when it passes by sensor creates a current sent to computer and this tells position of pistons and cam. PROM fires plugs in correct order in relation to RPM, Throttle position, ect.