[BK GTV6]

Hey all,

Hoping you all can help me figure this out. Car has been running great, but started to experience a loss of throttle response that feels like car isn't getting fuel at random times, including on freeway, which can be scary/dangerous.

Symptoms:
Seems to occur when car is warmed up and has been driven for awhile. Happens while in motion, so far in 2nd, 3rd, or 4th. Suddenly the car becomes unresponsive to gas pedal input and returns to idle RPM. Doesn't stall out, just isn't getting enough gas to accelerate or maintain speed. No amount of gas pedal pumping helps. Problem seems to go away almost immediately if i come to a stop and let it idle or if i turn it on/off. It's very random and inconsistent. Temps in NYC have been in upper 60's to 70's, so not particularly hot or cold.

Any ideas? fuel pump? injectors going? Some electrical short with Bosch injection system?

85 GTV6
Thanks!

 

[vintagemilano]

When was the last time the fuel filter was changed?

 

[alfaparticle]

Agree. Sounds like a fuel problem.

 

[sportiva]

The duel relay controls fuel delivery via the fuel pump and injectors. Even if the pump and injectors are in good order if the dual relay falters but does not fail the fuel delivery will be compromised.

 

[Sekal1978]

Wait it returns to idle rpm while moving in gear?

 

[Pastafazoo82]

You might be dealing with a low voltage supply to the ecu. My 82 will do weird things like not accelerate if the fuses have even a little corrosion on them from sitting. I would check battery ground and the fuses that work with the ecu. I got in my car last year and it did this not-accelerating problem thing the first couple mins of running. I just rotated the fuses and it never did it again. good luck!

 

[BK GTV6]

Thank you guys, all helpful. Gonna dive into this this week along with Greg's L-Jetronic troubleshooting guide.

 

[BK GTV6]

Wait it returns to idle rpm while moving in gear?

No, with clutch depressed.

 

[alfaloco]

BK GTV 6, why not check the easiest and least expensive things first? As was mentioned, fuses 2, 5 and 8 are critical to the ECU functions and starting. If you have the cheap aluminum fuses, replace them with brass or copper from Centerline Alfa, and clean the contact tabs with a pencil eraser. After that, I agree with the opinion that you have a fuel feed issue, and the easiest place to start is with replacing the fuel filter next to the pump. If that doesn't yield results, then check the connections and power to the fuel pump itself.