All cylinder misfires after fuel pressure sensor replacement

bhub86 · Post by **bhub86** » 07 Oct 2021, 06:33

My original fuel rail sensor failed and I swapped it out for a cheap aftermarket sensor (big mistake). It lasted about 3 months before it started leaking small amounts of fuel from the gasket. Fast forward a few weeks and the fuel starts gushing out. No surprise but the aftermarket sensor was notorious for cracking and leaking after a few months.

I got a Bosch sensor from NAPA and swapped it out at home. When I removed the broken sensor I realized that the entire bottom half of the plastic sensor had broken off in the sensor port. After some prying out I was able to remove it. However there were still some small bits of plastic shards in the sensor port. I did my best to remove them and then ran the fuel pump for a few seconds to flush out any debris.

I installed the new sensor and everything seemed to work OK but within a day I noticed that I was getting rough idle. The scanner now shows misfires on all cylinders.

After reading some threads my gut says the problem could be:
- Debris didn’t completely flush and it clogged all the injectors
- Debris didn’t completely flush and it fouled the new sensor, causing some sort of low pressure on at the fuel rail, which would explain all cylinders misfiring

Any thoughts/recommendations on troubleshooting?

Post by **ggleavitt** » 07 Oct 2021, 12:03

Got a PN for the sensor you installed?

No idea on your exact problem but pulling the fuel rail and checking the injectors probably wouldn't hurt.

This is a 2007, you do the valve covers (and/or timing cover) and PCV yet? Might a good excuse to do now them since the rail has to come off to do the job.