What would cause a 85 V6 to start up, idle for a second or two and die, then throw the code 33 (MAP sensor)?
Especially considering the MAP sensor is new, and all vaccum lines have been checked for leaks and are OK.
IAC is also new, and throttle body and upper plenum have been cleaned.

Sounds like the fuel pump relay or oil pressure switch. gets fuel while cranking engine but not after it starts.

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Signature courtesy of MinnGreen.

sounds like a fuel system problem to me, too. pressure ok?

I don't know about the code 33, but wouldn't timing being off (being REALLY off) cause the engine to die? Do you know if the timing's close to being where it should be?

-Jeff

I would say fuel pump, or something in the fuel system. clogged fuel filter maybe. get a fuel pressure gauage, start it up, and have someone read it for ya. the timing wouldnt have much to do with it, if its to far off, it wont start.

For a real stretch...

Ignition module.

Sounds stupid (it's got spark!), but I had one car that did that (started and died) and it turned out that the module was fried. Something switches inside it over 400rpm that passes control to the ECM. If that fails, the thing will run up to 400rpm, then when it passes control the ECM no longer see pulses coming from the distributor so it shuts off the injectors. (?!).

What can I say - it happened!

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87/88 V6 5spd "FormulaGT"

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I get a similar situation almost every morning. The car starts fine, runs for a few seconds, then dies. I turn the key, it fires right up, and its fine for the rest of the day, weird.

Yep!

The ECM needs ignition pulses to keep the FP running. If the oil pressure switch is bad and the ECM isn't getting the pulses, it won't keep the pump running. What would happen is that at key on, the ECM will run the pump for two seconds to prime the system. Once the engine starts, the oil pressure switch never closes to run the pump and the ECM isn't getting ignition pulses so the engine dies.

Perhaps a clogged fuel filter?????????????/ Ed

Fuel filter is new, so thats not a problem Timing could be a posibility, but why the MAP sensor code?

The MAP sensor reports vitla data to the computer to adjust a multitude of things, like fuel flow, mixture, and so on.

I had a similar problem and the code 33 showed up. I replaced the MAP sensor, and it was fine.

Mine ran really rough, and would only perform with my foot on the floor. Look for cracked or missing vacum lines first.

MAO sensor will set you back 45-50$. But remember, the ECM will ony give a code to the effected part or area, that
doesn't mean that is the soultion.

mike

just my .02

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If it won't start up again right after it dies, it could be plugged exhaust.

It could be the ECM coolant sensor (not the gauge temp.) it tells the ECM when the engine is cold and to give it nore fuel. if everything works good after the engine is warmed up, then i would change the coolant sensor (ECM).
Don