P0202 and P0264 - Fuel Injector issue

scwd1 · Post by **scwd1** » 29 Dec 2023, 21:10

Long time lurker, first time account holder and poster.

So, as the title suggests, I have 2 codes that come up, however these codes don't come up at the same time, they seem it alternate which comes up.

I tried a large number of things to fix this issue and I'm at a loss. The engine shakes, spews raw gas from the exhaust, getting 2 - 5 MPG, it's driving me nuts.
Any insight would be amazing.

Vehicle:
1998 Volvo S70 Base Model

Things I've done:
Spark Plugs
Spark Plug Wires
Distributor Cap
New negative terminal
Injector #2 replaced

Troubleshooting done:
Noid light test - All injectors pulsed as they should (Light was quite dim)
Ohms Test on injectors themselves - tested to 17.5ohms
Checked wiring - not entire harness, just in the areas where the injectors are and down to the side of the block by the heater hose connections
Checked all fuses

Post by **scot850** » 30 Dec 2023, 08:10

I would suggest if you have not already done so to pull the spark plugs and do a compression check and post the results.

Neil.

Post by **volvolugnut** » 30 Dec 2023, 08:46

Can you test the injectors for spray pattern? They may be dirty or very worn and leaky.

Both of these codes appear to refer to cylinder 2. Here is a link to read
https://www.obd-codes.com/p0264
volvolugnut

Post by **scot850** » 30 Dec 2023, 10:39

Reason for asking about the cylinder compressions is due to possible burnt valve.

Neil.

scwd1 · Post by **scwd1** » 30 Dec 2023, 20:37

volvolugnut wrote: ↑30 Dec 2023, 08:46 Can you test the injectors for spray pattern? They may be dirty or very worn and leaky.

Both of these codes appear to refer to cylinder 2. Here is a link to read
https://www.obd-codes.com/p0264
volvolugnut

Thanks for the link on the codes, I'll actually save that for home use, I work at an auto parts store so I have access to a lot of documents most people don't have, including an entire database on the obd codes.

I don't think it's them being dirty, the only one giving me trouble is the 2nd injector, and I just replaced it because these codes have been popping up, so it's a brand new injector.

scwd1 · Post by **scwd1** » 30 Dec 2023, 20:43

scot850 wrote: ↑30 Dec 2023, 08:10 I would suggest if you have not already done so to pull the spark plugs and do a compression check and post the results.

Neil.

I can definitely do so, however, after so further testing today, I redid the noid light test, and the light didn't even come on at all, which leads me to believe a bad ground, I removed the noid tester and put it back in, it lit up (dim). So I decided to use a voltmeter and that was only reading about 1.5 - 2 volts, while all the others read much higher.
So it's gotta be something in those wires right? How would I track that down?

I got my hands on the wiring diagrams at work (I work at an auto parts store), but I have absolutely no idea what I'm looking at or even where these wires go in the engine.