Turbo Efi on N/A-Need help engine Flooding! - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #1 of 21 (permalink) Old 03-14-2005, 08:32 PM Thread Starter
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Turbo Efi on N/A-Need help engine Flooding!

OK i have just about finished swaping the entire turbo efi system from a 81zxt with 83 dizzy, into my 77 280z. It will start and run but it will only let my rev the car and keep it in the upper rpms for maybe 10 secs, then the car bogs way down and it sorta idles, its really lopy and rough. It also pops both through the intake and exhaust (more intake). The car ran well before this swap, i wanted a newer efi system in there so this is what im doing. I am still using N/A injectors but that is the only N/A part.

Fuel Pressure is at 38 psi
Afm and coil braket have grounds running to intake man. DVOM shows 0.001 ohms of resistance to both the afm and transistor grounds.
Water temp sensor reads 5.3 K Ohms with a water temp of 29 F.
TPS adjusted correctly
All injectors firing
Dropping resistors plugged in although not sure how to test them..
Everything is wired corrected as far as i can tell, i have checked and rechecked connections. Everything is clean.

So what is left to check and mess with? Timing is about the last thing but i have moved the dizzy shaft back and forth between the two teeth is will run at all on and it doesnt get much better..Maybe i have a bad ECU?

Please any help is great thanks!

[b]Jason:

'77 280zT coupe: 8.8:1, flat tops, .030 over, Msd-6al, 60mm tb, cold air, 2.5" exhaust and DP, no cat, GReddy type RS BOV, medium intercooler

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post #2 of 21 (permalink) Old 03-14-2005, 08:44 PM
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Re: Turbo Efi on N/A-Need help engine Flooding!

is the motor turbo? cuz the turbo efi produced more fuel pressure right? maybe thats the problem dunno never switched a wire harness before


1982 280zx turbo
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post #3 of 21 (permalink) Old 03-14-2005, 08:46 PM
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Re: Turbo Efi on N/A-Need help engine Flooding!

Why???.

Not trying to be a smart ass but some people have said the n/a efi system is better than the turbo efi system.

Are you going to be adding a turbo to your engine?.

Check and recheck your connections over again, Make sure you don't have a vacuum leak somwhere.


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Rebuilt 83 L28 N/A engine, Megasquirt 2, Intercooler, T3/T4 turbo, N42 intake, Rx7 injectors, 83 5spd, 3.70 Clsd.
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post #4 of 21 (permalink) Old 03-14-2005, 08:46 PM Thread Starter
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Re: Turbo Efi on N/A-Need help engine Flooding!

Well a turbo engine is nothing more than a N/A engine at idle so it should be ok on the fuel. This is an n/a engine, specs are in my sig.


[b]Jason:

'77 280zT coupe: 8.8:1, flat tops, .030 over, Msd-6al, 60mm tb, cold air, 2.5" exhaust and DP, no cat, GReddy type RS BOV, medium intercooler

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post #5 of 21 (permalink) Old 03-14-2005, 08:48 PM
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Re: Turbo Efi on N/A-Need help engine Flooding!

you sure the firing order is correct? sometimes the number 1 on the cap isnt correct. turn it to top dead center and look at the rotor, and then do the firing order. counter clock wise 153624



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post #6 of 21 (permalink) Old 03-14-2005, 08:49 PM Thread Starter
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Re: Turbo Efi on N/A-Need help engine Flooding!

Vaccum leaks wouldnt make a car run rich, but lean, air would be getting in that was metered for the fuel present. The Turbo efi is the best stock efi for l6 motors ( not aftermarket) There are a coupel different people that have down this, the fuel maps are more advanced, and the systems adds a CAS and O2 sensor to first gens.



Post Edited (Mar 14, 5:51pm)

[b]Jason:

'77 280zT coupe: 8.8:1, flat tops, .030 over, Msd-6al, 60mm tb, cold air, 2.5" exhaust and DP, no cat, GReddy type RS BOV, medium intercooler

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Re: Turbo Efi on N/A-Need help engine Flooding!

Good idea surf, i checked and firing order is correct. Thanks


[b]Jason:

'77 280zT coupe: 8.8:1, flat tops, .030 over, Msd-6al, 60mm tb, cold air, 2.5" exhaust and DP, no cat, GReddy type RS BOV, medium intercooler

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post #8 of 21 (permalink) Old 03-14-2005, 09:00 PM
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Re: Turbo Efi on N/A-Need help engine Flooding!

Make sure the AFM is pluged in, make sure the boot between the TB and AFM is tight. I've done both of the above and it produced similar results.


Justin T
72 240Z L28, 5-speed (sold)
77 280Z 5-speed (t-boned 8-25-04, crushed by tree june 08)
78 280Z 5-speed, p79/f54 engine, tokico springs/struts, 3.9 subaru sti LSD, custom header, custom exhaust. 16x8 wheels with 225/50 tires. weekend/autocross warrior.
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post #9 of 21 (permalink) Old 03-14-2005, 09:25 PM Thread Starter
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Re: Turbo Efi on N/A-Need help engine Flooding!

ill recheck my connections on the afm pure the wiring diagram, the boots are tight but ill recheck to make sure. Thanks

Im going in and out to the garage so if i dont respnd to answer a question i will soon just check back, thanks so far


[b]Jason:

'77 280zT coupe: 8.8:1, flat tops, .030 over, Msd-6al, 60mm tb, cold air, 2.5" exhaust and DP, no cat, GReddy type RS BOV, medium intercooler

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post #10 of 21 (permalink) Old 03-14-2005, 09:37 PM
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Re: Turbo Efi on N/A-Need help engine Flooding!

Is that fuel pressure at idle? It should be much lower than 38 psi if so. It should be closer to 28 psi. I would also switch out to the turbo injectors, or back to the NA AFM. They are kinda set together, as a larger AFM works with larger injectors. You might be rich at an idle because of the fuel pressure and then lean off idle due to the smaller injectors. Just an idea. I would check the plugs and see what they tell you. Personally I preffer the older EFI over the turbo stuff (that's what I run in my turbo car).
Jim

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