924Board.org

ggrecian · Joined: 20 Oct 2013 Posts: 29 Location: Pa

I have a 1987 porsche 924s..i had an intake leak at an intake manifold gasket but it ran pretty nice considering the easily heard intake leak.i drove the 924 for 20 thousand some odd miles with a little mis. So i replace the intake manifold gaskets and now it cranks but will not start..i replaced the distributer cap.rotor button.plug wires plugs.ignition coil.fuel injectors.i am tired of replacing things and need to get it to start again.need to find the root.have spark.have fuel to the fuel rail.help!!! How do I test the air flow sensor.will not start with starting fluid.so i think i dont have any air?help?
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porschelover

larchie · Joined: 19 Jun 2003 Posts: 297

If all vacuum lines are in place and no serious vacuum leak from the manifold (i.e., something like cylinder compression nearly nil), it sounds like a timing issue: e.g., re-check distributor proper rotation, wires to the cap proper order, finding TDC for #1 spark so forth. My guess is that the issue is most likely the way stuff was put back together -- something not properly connected..

Slam · Posted: Mon Oct 21, 2013 1:23 pm Post subject:

924S, right? Are you sure you plugged in your AFM, your TPS, DME sensor? Also try swapping the plugs for the speed and reference sensors. They may be backwards. You're probably not in much trouble.

HTH.
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'88 944 Auto - may or may not resurrect

ggrecian · Joined: 20 Oct 2013 Posts: 29 Location: Pa

Thank u guys sooo much.Not sure what the AFM TPS and DME sensors are or where they are located.i made a conscious effort to plug everything back in.any help with where they are located.also at one point i did have the reference and speed sensors swapped----no spark.got them back in proper plug.have spark now..did i do damage by accidently swapping the two and trying to start it many times?ordered a dme relay.should b here soon
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porschelover

ggrecian · Joined: 20 Oct 2013 Posts: 29 Location: Pa

Ok i got u (AFM) air flow meter.(tps) throttle position sensor.air flow meter definately plugged in.not sure where the throttle position sensor is located.also if and when purchasing a reference and a speed sensor.are they the same item? just buy two and put in corresponding plug?cant find speed sensor to purchase
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porschelover

Slam · Posted: Tue Oct 22, 2013 1:01 pm Post subject:

Sorry, I should have gone into more detail. Anyway, the two connectors in the bracket at the back of the intake manifold are the plugs for speed and reference sensors. DG and BG I think they're marked. Check the colored tape on them (if it's still there). It's easy to mix them up. The sensors themselves live at the back of the engine on the bellhousing right beside the window for the TDC mak on the flywheel. Much has been written about these little bastards, so I won't reiterate. But if you had your manifold off to do the gaskets you may have disturbed them. BTW, those intake gaskets can be changed without pulling the manifold...

TPS lives right under the throttle body, although the car will run fine with it disconnected. Heck, in some cases run better!
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'88 944 Auto - may or may not resurrect

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Aftermarket speed/ref sensor is Facet 12141710668, FWIW. I can sell you a pair for $125 shipped.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3