RE: [alfa] 164LS engine stall problem continued

[hagen_jason@xxxxxxxxxxx]

Hmm.  I can send you a source for a full set of new injectors for $250.  However, I doubt very much that it is injectors.  Have you checked to see if there are any air leaks?  I had a rip in my intake boot leading to the plenum which caused similar problems.

You could possibly have an intermittent igntion control module.  there are two on the car.  You may have one on the fritz which is causing 3 coils to stop intermittently.  These units also have a ground wire running off them which should be checked.  Finally, the connectors to them are in a tight locationa and stretched and bent to their limit.  You may have a bad wire in there.

Finally, the ECU and most of the other components ground to the intake plenum.  The intake plenum needs to have a solid electrical ground path to the rest of the engine.  Their is a small ground strap over near the throttle body which accomplishes this.  This strap usually falls apart over time.  The bolts holding the plenum down are insulated by grommets, so that doesn't really provide the ground.  I added a new strap from the plenum to the engine to ensure solid ground at all times. Also, check the ground strap from the engine to the chassis.

Let me know how this goes.  I would start with the ground straps...

--
Jason Hagen 
Chicago, IL 
'73 Spider 
'95 164Q 
'91 164S

-------------- Original message -------------- 

Thank you Jason,

Does not matter it is idling or not, the engine stalled for a second.  But if throttle is pressed when this happened, most likely engine may be able to restart running.
It as if someone shut the ignition down for a second or so and then reconnect it.
Everything you said have been checked or replaced except cleaning fuel injectors. Could dirty injectors cause this?  It is running smooth except when this happened.
The IAC is buzzing loud all the time whether engine is running or not, I dont remember it is this loud a year ago.

I am running out of idea.  I want to send injectors to be cleaned and also check for broken electric connection.

Karl

-----Original Message-----
From: hagen_jason@domain.elided [mailto:hagen_jason@domain.elided] 
Sent: Tuesday, November 23, 2004 6:23 AM
To: Karl Chen; alfa-digest@domain.elided
Subject: Re: [alfa] 164LS engine stall problem continued

The fuel pressure jumping up is a rathole.  That is not the issue and is likely just a sypmtom of the injectors shutting down and fuel pressure valve poppint closed in the regulator.  Besides, high fuel pressure would be better anyhow.

Does it stall only at idle, or under throttle load as well.  Could you have an intermittent idle control valve?  Is the valve still "buzzing" after stalling?  Is it a hot soak problem?  What if you leave the hood open while idling and help keep things cool?  You said you replaced the crank angle sensor, hugh?  Have you checked out the throttle switch, O2 sensor, air leaks, coolant temp sensor and wiring?  How many miles?  Have the injectors ever been cleaned and serviced?  Try running a can of BG Products 44K through the fuel system and see if that helps...

--
Jason Hagen 
Chicago, IL 
'73 Spider 
'95 164Q 
'91 164S

-------------- Original message -------------- 

> Taming of the shrewd continued: 
> 
> 
> 
> My 94 164LS has engine stall problem. It is very easy to duplicate the 
> problem, just let engine idle and it will stall in few minutes. 
> 
> So far I have exchanged good ECU and AFM and crankshaft sensor and fuel 
> pressure regulator found the problem still exists, 
> 
> There is one thing I observed: just before engine stall, the fuel pressure 
> always jump up 8-10psi (from 40psi to 48psi) and then 
> 
> engine stop immediately. 
> 
> 
> 
> Any idea? 
> 
> 
> 
> Karl Chen 
> -- 
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