3.6 intake backfire

Series900 · 08-08-2004, 04:59 AM

Damn if I had a bang on startup yesterday, then no start, popped the lid and 4-5-6 intake hoses blew off, and the two large center hoses. Sure hope that was all the damage. Have to take the intake system apart and realign. Any cis type airbox blow up similarities to look for on the 93 3.6 intake system? At the shop sunday am, track at NHIS monday, cobblers kids need shoes....

Bill Verburg · Bill Verburg's Garage

Sounds like the reference signal from the flywheel was way off. No known issues ala cis

Series900 · 08-08-2004, 05:44 AM

The starter is starting to fail, HA! Bendix is kicking out intermittently, thus not allowing full revolutions with key, think it stopped and fired at the wrong time, boom! All ripped down and reattaching boots now.

Series900 · 08-08-2004, 06:54 AM

All good, reattached all boots, even the left side was slightly ajar, was a big boom! Stretched the legs for some coffee, ready for the track again. The starter is defintley fading away, with incomplete starts, the fuel is sent , but not enough spin time at the flywheel, thus when the spark gets compression its a, little rich! BOOM! yank the starter this week

Britwrench · 08-08-2004, 07:19 AM

Distributor drive belt has broken, pull the caps and check that both rotors turn.

ChrisBennet · ChrisBennet's Garage

Yeah Damon, the DME shouldn't fire until it gets enough info. An incomplete spin would result in a failure to start. Lemme know if you need to borrow 964 distributor.
-Chris

Series900 · 08-08-2004, 11:00 AM

Got me worried, popped secondary cap and the rotor is spinning. Phew. The problem is the starter drive is kicking out, and I get incomplete revolutions. need to check battery draw whilst cranking, Either battery low on cranking amps or starter drive is failing. Anyway the boom was due to incomplete starter revolutions resulting in a rich condition and a full spark resulted in a backfire boom, resulting in all boots off. reattached and she is running great. Thanks

Britwrench · 08-08-2004, 11:07 AM

I hope that the problem is solved, never seen that intake manifold blown off for any other reason than broken distributor belt.

With the Motronic system, an over-rich mixture at start should never happen. Check the system with the Bosch "hammer" once it's running.

deeppurple · 08-08-2004, 02:03 PM

A similar thing happened to me a couple of years ago. It was the distributor caps/rotors (forgot which one was which...).

Cheers

Series900 · 08-08-2004, 07:27 PM

again the starter is not healthy, it will not continually crank the engine, the bendix kicks out after a third of an engine revolution. I get lucky and it fires off. think if you only keyed start for one second , the difficulty in getting the motor to catch. secondary rotor is spinning, belt good, engine runs out fine, problem lies in starter engagement, with one second spins, it is difficult to start, but hell its a race car, not stoppin for coffee, side note loaded enclosed trailer with RSA, tow from shop to home, 5 miles, hit F'n deer, never saw it, ford tough, right into bumper and under neath truck n trailer, jeez hate killin things. Hope monday is better.