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GA16i No-Start Dilemma (long)

1258 Views 3 Replies 2 Participants Last post by  jdfromla
Hey Guys,

Infrequent poster - sometime lurker here with a newly rebuilt GA16I that refuses to start. I checked the archives but could not find anything like the problem I'm having on a brand new engine. Let me lay it out for you.

I built this engine out of a NOS NIB factory short block and a rebuilt head after my friend lost his timing chain and bent the exhaust valves. There are many new parts including a new oil pump and cover so nothing was spared.

The problem is fuel-related. The distributor/ crank angle sensor is brand new, indexed properly and functioning. Pouring a little gas down the throttle body makes the engine run instantaneously for ten seconds or so.

What I tested thus far:

This is a TBI engine. The only code I got from the ECU is 55. The Haynes Manual shows 44 to be the "no problem" code for the TBI motor so what's up? There is no 55 code except for the multi-port FI engine which is the "no problem" code.

The Central Branch of the LA Public Library has the shop manuals for almost every car ever built so I have access to a factory manual. That means I have a good schematic. I forgot to note the proper trouble codes from the manual because I thought Haynes would at least get that right.

The fuel pump and relay are operating. I bypassed the relay with some jumper wire and tried a start that way. No go. Verified fuel flow for the 5-second pre-start and when turning the key to the start position by running the fuel filter output into a gas can. Also took the fuel filter out and pumped the bare fuel line output the same way. No difference.

Fuel injector impedance: 1.7 Ohms (good)

Continuity of both wires to injector verified

Test for battery voltage at pins 101, 110 of the 16-pin ECU connector passed.

Test for continuity on the ground side with pins 107, 108 and 116 passed.

Injector was tested and cleaned by RC Engineering to new specs.

Verified fuel at the injector itself by pulling the injector back out and seeing a quantity of fuel in its housing.

Made and remade every harness connection and ground.

Without any set trouble codes (other than 55), I have nothing to go on. One thing I do not know is the actual fuel pressure when cranking or with the relay bypassed and running the fuel pump. If necessary, I will cut up my Bosch K-Jetronic rig to tee into the fuel line.

This is my 17th engine. Usually they start right up and run. This is really the first time I've had a problem that couldn't be solved in a few minutes.

Other than that, I am at a loss. Hopefully, someone here can help. I'm sure I missed something stupid.

Thank you in advance,
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Does the oil light ever turn off while cranking?
Code 55 is for the 89-90 GA16I the all clear code, not 44
The computer on the GA16I is rather dumb, it monitors a very small amount of the engines systems, and usually takes quite a big thing to set a code.
I am thinking you should also check the spark plug wires and verify they are in 1-3-4-2 order. Also check under the distributer cap, and make sure the rotor is firmly bolted in place, there is a screw that keeps it in place that if it were to be missing or come loose would cause some of those symptoms.
There are more things to check after theese, but this is a good place to start.
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