Running Rich Flooding out need help fast race saturday

[beretta777]

Ok this is what i got i did a 3400 head and intake swap on a good running 3100. Ported the exhuast on the heads and poished the heads and intake. Running 3100 fuel rail and 3400 tb. Egr valve bolted on to cover holes but not pluged in or bolted to exhuast.
Test started it, it ran really ruff at first like it was cammed out which its not after awhile it smoothed out. Shut the car off and tried starting back up and wont it acted like it was flooded out. Put foot to the floor and turn over 5 to 7 times starts trying to fire and does runs rough and rich then smooths out. Does this every time trying to start warm.

Any ideas guys help me please?? Could the egr valve be doing this?? Its also a 94 didnt have a maf when i got it should it have one?? The intake tube and filter is also off right now would that or any of the plugs there have anything to do with this??

Any help ideas things to check would be great. Have a race saturday and its a dirt track car going to get hot and gotta start it back up.

[3X00-Modified]

No maf's on 94's and what else did you change? You didn't change the injectors did you? The EGR needs to be blocked off somehow If it's failing it will allow a huge vac leak so just put a plate of something over the holes or in place of the gasket to seal it shut solid.

It sounds like something isn't hooked up properly, electronic wise or it has a bad vac leak.

[heavywoody]

If the EGR isn't bolted to the exhaust, then you have a HUGE vacuum leak right there. Get that fixed.

[beretta777]

Nope used the 3100 injecters that came out of the car in the first place. Egr is blocked with the egr and gasket. The only other thing i changed is i put in a manual temp gauge and used the sensor hole by the intake and themostat. Could that have been the coolent temp sensor and not just a temp sensor to the gauges like i thought. And that not being hooked up would cause problems right?? The EGR is blocked at intake and exhuast theres a pipe plug where it when in there.

[heavywoody]

The sensor you took out is the Engine Coolant Temperature sensor. It feeds the engine temp information to the ECM to adjust the A/F ratio.

The sensor for the gauge is a single wire sensor in the corner of the rear head, near the brake booster (in the original heads - 3400's didn't have provisions for that setup, so if you want to keep the gauge functioning on the dash, you have to convert to a 96 sensor which relocates the gauge sensor into the coolant temp sensor you removed).

I'd put that back in and go from there.

[3X00-Modified]

Yeah as Geoff said that is a two pin sensor that relays the coolant temp to the ECU... The gauge sensor is actually the one wire one that is on the back corner of the head on the 3100... Which I'm guessing you also removed since you didn't note anything about re-wiring or fixing that sensor.

Right now the ECU thinks the coolant temp is -40* so it's dumping fuel in like crazy.

As far as the EGR if the valve itself is there and there isn't a pipe attached to it that could be causing a leak to atmosphere if the valve is not fully closed. You need to block it somehow to ensure its not going to open anytime.

[beretta777]

Ok thanks guys ill try putting that back in. so could i put that manaul gauge in the sensor on the head?? I didnt remove the sensor on the head just the on by the themo didnt know there were two.

[3X00-Modified]

Which year and engine heads do you have? Because from what I can remember 3400 heads did not come with that rear corner sensor hole.

[beretta777]

I really couldnt tell you what year no i idea im thinking in the 2000s didnt pull them out of the car my self just brought used if nothing else i guess i dont need a temp gauge just would be nice is there a way to tap into the old gauge wires with a electric gauge??

[3X00-Modified]

Just check the heads... if you have the hole on the corner of them then no issues using it since yes the one green wire sensor that's there was only for the original dash gauge, however if that hole is not there then you need to either drill and tap it in the same location as the old head to give you a spot, OR find another way to install the mechanical gauge you want. Every electronic gauge has a different sender so I doubt you could simply tap the wires of the sensor your putting back.

[beretta777]

Ok thanks first is getting it running ill worry about the gauge later thanks again greatly appreciated.