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Old 05-31-2018, 05:18 PM   #1 (permalink)
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Default Fuel Injection help 8v 1.6 in Samurai

Getting to my wits end and would really appreciate any help.

I had a 1.6 8v in my 88 samurai and just used the original carb.

After a lot of trouble with emissions and intermittent issues I am converting to FI and it simply refuses to run properly now that I am 'finished'.

I used an external F150 fuel pump. Ran all new line, FI line from pump forward, coming from a brand new 15 gallon tank. Return line is the old metal feed line.

Had the harness professionally modified, ECM was rebuilt with new capacitors. The sensors are all pick a part/ebay finds, and I ran all new vacuum lines.

Idled really rough which turned out to be the EGR sticking open. The idle was turned way up by whoever had the throttle body before me so I blocked off the EGR, and turned it down. The EGR passage in the throttle body is also full of buildup.

Then it had spark knock in 4th and 5th gear. Adjusted timing and did a valve adjustment and that seems to have stopped. Changed the plugs, they were white from the knock I assume.

Replaced the fuel pressure regulator on the TB with a new one and have been trying to get the FI Light to work but with no luck. Tried running it to the in dash light for the carb setup from guides I found online, and also tried just wiring an LED from the ECM wire but I can't get codes to pull.

Right now it stumbles on idle, revs up but seems to be running very rich. Plugs are black and the exhaust puffs dark.

02 sensor is also black. Replaced it and it made no difference, just dirtied up the new one instantly.

A new EGR is stupid expensive and I really don't want to just throw money away if that's not the issue. I don' have to pass emissions right this second so I'll deal with that later.

My current idea is fuel pressure issues. Debating buying and adjustable in line regulator but again I don't wanna throw away money.

Sorry for the long read, just trying to get all the info out there at the start.
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Old 05-31-2018, 07:37 PM   #2 (permalink)
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The first thing that jumped out at me was the F150 fuel pump - every time I've seen that used, I've seen exactly what you're experiencing - over fuelling.

Have you checked the fuel pressure?
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Old 05-31-2018, 08:54 PM   #3 (permalink)
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I actually thought this was an old post when he said F150 pump. IIRC too much pressure


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Old 06-01-2018, 12:59 AM   #4 (permalink)
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I haven't checked the fuel pressure yet, moved houses mid build and I can't seem to find the gauge i bought for the task.

The f150 pump was just from a list of parts for 8v FI I found googling so its probably some ancient forum post.

Is there a different pump I should be using? Should I also run an inline regulator with its own return?
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Old 06-01-2018, 07:36 AM   #5 (permalink)
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There are at least two different pumps for the F150, and one of them delivers a higher pressure than the other - there is a possibility that fuel pressure is your problem, and the first step is to find out what pressure you're running.
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Old 06-03-2018, 05:54 PM   #6 (permalink)
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Alright so 2 gauges later, the first one leaked everywhere then wouldn't read, I found out its pushing about 75 psi.

Found a buddy who had a new aeromotive 13301 regulator from a project that never happened that he'd sell cheap. Gotta go get fittings and get this installed once its a little bit less miserable in the garage, I'm in AZ and its over 100 today.
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Old 06-03-2018, 10:03 PM   #7 (permalink)
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If I were you I would be looking for a different fuel pump - the one you're using is intended to supply a significantly larger volume of fuel (because the F150 has a larger engine), and at a significantly higher pressure.
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