No fuel coming out of injectors

[MonkeyFella95]

I've already replaced all the vacuum lines and the O2 sensor. I think it's likely the CPR, that and the frequency valve are the only original parts in the fuel system now. I'll connect a pressure gauge and test it in the next few days. I've not adjusted the CO mixture yet, I want to be sure that everything else is working correctly before doing that, my car still had the original factory seal on it when I got it, I've already drilled it out and replaced it with a bung ready to do the adjustment after I know everything else is in spec. Out of curiosity I did connect a dwell meter to see what the measurement was but the dwell was stuck at 87-90, not sure if its because I'm using a digital meter or because there's an issue with the lambda system but I'll look at that more when I've tested the CPR properly.

[David T]

I've already replaced all the vacuum lines and the O2 sensor. I think it's likely the CPR, that and the frequency valve are the only original parts in the fuel system now. I'll connect a pressure gauge and test it in the next few days. I've not adjusted the CO mixture yet, I want to be sure that everything else is working correctly before doing that, my car still had the original factory seal on it when I got it, I've already drilled it out and replaced it with a bung ready to do the adjustment after I know everything else is in spec. Out of curiosity I did connect a dwell meter to see what the measurement was but the dwell was stuck at 87-90, not sure if its because I'm using a digital meter or because there's an issue with the lambda system but I'll look at that more when I've tested the CPR properly.

There are a LOT more places for vacuum leaks besides the hoses. Injector seals, gaskets, screws, "O" rings, etc. The only sure way to know is to do a smoke test.

[cis6409]

when the dwell is reading 87-90 it usually means it's too rich and needs to be leaned out (counter clockwise turn) when the time comes to adjust it.
Definitely fixing and getting everything else checked out is the way to go before adjusting it.

I had a similar issue on mine but when it came to leaning it out it still read 87-90 no matter what.
After a bit of head scratching and conversations with others found I had a short to ground on the lambda ecu which was causing the high steady reading. Replaced the lambda ecu and everything started working again

Good luck with the diagnosing

Shane

[82DMC12]

Just do a smoke test to rule out vacuum leaks. This smoke machine works great -

https://www.amazon.com/AutoLine-Pro-.../dp/B07JVT1NG2

You have to seal up the air meter plate before using the smoke machine. I've done this using a latex balloon and a very large zip tie. With the air cleaner cover off, inject the smoke into the hose that goes between the air cleaner cover and the oil filler / PCV mesh. If you have no leaks, eventually all you will find is smoke coming out of the dip stick tube (not an issue).

Technically you could have a vacuum leak that only occurs when the engine is hot, so you might do a cold test and a hot test just to be 100% if you don't really know how the vacuum routing works when hot vs cold.

[MonkeyFella95]

Thanks for the advice, I'll order a smoke testing machine to check for vacuum leaks.

Tested the primary and control pressure cold, primary pressure was low (about 58PSI / 4 bar ) which explains why it struggles during warmup so I checked the voltage at the pump and it's only 9.5V so I'm losing about 4V somewhere which would explain the low primary pressure. My plan is to replace all the grounding bolts I've already cleaned with new brass bolts and add a new grounding point to the frame by the interia switch.

[Bitsyncmaster]

Thanks for the advice, I'll order a smoke testing machine to check for vacuum leaks.

Tested the primary and control pressure cold, primary pressure was low (about 58PSI / 4 bar ) which explains why it struggles during warmup so I checked the voltage at the pump and it's only 9.5V so I'm losing about 4V somewhere which would explain the low primary pressure. My plan is to replace all the grounding bolts I've already cleaned with new brass bolts and add a new grounding point to the frame by the interia switch.

Check that two pin connect near the fuel pump. You can also check the voltage at the RPM relay.