SOHC fires and dies. (help)

[maldo]

I managed to get the SOHC firing tonight. It will start, hit 1200rpm, and die. Timing might be off slightly but it appeared to be fine. If I start off with a 0 value at all rpm values on the S-AFC it seems to die quickly. Bumping the points below 2000rpm up to 16% enrichment seems to allow the motor to run slightly longer. <P>It is running open header right now, not sure of the affect that no backpressure would have on this motor. Could be that the exhaust valves aren't closing quick enough, basically allowing air to blow thru. This leads me back to the timing being off.<P>If any SOHC owners read this: Could you please do me a favour? Take a look at your intake manifold, above the alternator. There is a fitting below the #1 runner. The larger fitting points toward the firewall, there is a smaller fitting that "T"s off of the larger one, pointing towards the battery. Could you take a look and see where these 2 hoses go? Thanks.

[marshmallow15]

ive ran open header on my sohc before it should work fine....ill take a look on those hoses for ya tomorrow.

[maldo]

Thanks, appreciated that. I wouldn't suspect that the motor needs that much back pressure, just trying to eliminate suspects.

[mmonid]

Is your intake on? I found out that if the intake and MAF sensor is not attached to the throttle body, it fire, but it will die right after that.

[rikymaru]

"It is running open header right now, not sure of the affect that no backpressure would have on this motor. Could be that the exhaust valves aren't closing quick enough, basically allowing air to blow thru. This leads me back to the timing being off."<P>That sounds like it might be our problem. Is this the stock engine or your turbocharged engine? If that is the case put the stock headers back on and try again.<P>Are all your pistons firing before it dies? If you want you can get a compression gauge and check it to see if your getting even compression across the board. If not then you might have a piston not going. I doubt it though since the car would still run; it would just do it rough whenever you revved. You'd have to have 2 or more for it to not work and in that case you'd hear the problem.<P>You could always have gotten lucky and just have 2 or more spark plugs. It has happened to the best of us I had some plug wires that went bad and I was trying to figure out why my car would die once revved past 3000 RPM's. Turned out that I had really bad spark plug wires and 2 pistons weren't firing AT ALL. It's a stupid problem but it would explain why the car will start and then die.<P>Is this your turbo engine? If so I'd bet my right arm you have a leak somewhere. A cracked intercooler pipe will do the exact thing you are talking about. And if it is rubber piping it might not even be a visible crack. The car starts bogging and will die off (also know this from experience)<P>Smell your exhaust and tell us whether it is lean or rich. I'm willing to bet it will be lean but hopefully your going to get a rich smell. After that do the compression check and see what you get on the cylinders. If you don't have even compression across the board then go from there.<P>Good luck with the car.

[maldo]

Got it working this morning. The S-AFC was the problem. I had the Flapper setting on 7 when it should have been 8 (maybe it was the other way around??) Either way, she runs.

[marshmallow15]

still need help with the hoses? heres what my bro and i found:<P>the bigger hose connected under the first runner is routed to the center of the firewall. it should be connected to the left of another hose with similar diameter and its hooked to the firewall (both of them)<P>as for the smaller hose that tees off, we couldnt see where it connects because it runs under the manifold and we didnt have enough time to jack it up, but i might have a hunch. do you have the smaller hose? if so does it say '1840' or '1841' on it? if so, then that smaller hose that tees off the bigger one is hooked up to the fuel rail on the right side as it curves over the manifold (when you face the car windshield)

[maldo]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR> the bigger hose connected under the first runner is routed to the center of the<BR>firewall. it should be connected to the left of another hose with similar diameter and its hooked to the firewall (both of them) <HR></BLOCKQUOTE><P>So do these lines go the the left or right fitting on the firewall?? The one that is above the alternator taps into the one on the other side of the head?? Just making sure I understand your post.

[marshmallow15]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by maldo:<BR><STRONG><BR>So do these lines go the the left or right fitting on the firewall?? The one that is above the alternator taps into the one on the other side of the head?? Just making sure I understand your post.</STRONG><HR></BLOCKQUOTE><P>the big hose is hooked to the left fitting on the firewall. the smaller hose that tees off, im not sure but i think it hooks up to the fuel rail. the smaller hose is just a hunch though.

[maldo]

Does the big hose connect to anything else at any point? The little hose goes to the IAC. The hose connected to the cross over pipe goes to the connection on the right side of the heater (along the firewall). That still leaves one connection that is above the starter, same size, any ideas?

[marshmallow15]

nope the big hose is only from under 1st runner to the firewall. i dont have any other ideas for the smaller hose that tees off because i didnt have good enough views to look at it.

[maldo]

What about from the other connection at the firewall? On the right side of the motor, disty side, there is the connection from the cross over pipe and another one beside it. Any idea where they go?

[marshmallow15]

you mean the firewall connection to the left? i'll check that out for ya tomorrow before i go to work.

[maldo]

Facing the engine there are the 2 connections. The left side one connects to the one previously mentioned above the alternator. On the right side, above the tranny, the crossover pipe passes under the disty. This pipe is to connect supposedly to the right side connection on the firewall. There is still a connection just above the starter, the two are basically side by side. Do they connect? Where do each of them go?<P>Thanks again,

[marshmallow15]

you mean if the crossover pipe above the tranny connects to the connection near the starter? i'll take a looksy.