Fpr problems?

[Adam88]

Well I took the vacuum line off my FPR and smells badly of gas, no leaks though. Gonna take it back to Rydell tomorrow morning... Would this cause a rougher idle? Also between maybe 600-1k RPM's I hear a constant taping noise, any ideas on what that could be? ( After its warmed up, I hear it more when its cooler outside ) Btw, no SES or SVS lights or anything like that, just running rough with a light constant tapping.

--Edit-- I notice the rough idle when I am stopped at a light and such.

[Adam88]

It also takes a few cranks to start most of the time, some times it starts right up. When the car is having a rough idle at a light, the rpms stay around 600 or so.

--Edit-- 04 Grand Am Se, 47k miles

[HornetGT141]

Well some of the tapping pertains to the engine's lifters, the 3100/3400s have that problem/annoyance.

For sure if it smells like gas then it is time to replace it. However, I just had mine replaced and the gas smell went away but everyonce and a while that "multi-crank" crap starts up again and I get some trouble. It seems to have that "crank" problem when the engine is warm rather than cold.

Although tonight the engine was warm and it didn't have the crank problem so I have no idea. GA's are too weird to figure out...

[Coondog]

Definately the FPR will cause the rough idle and hard starts. Too much gas at low rpms makt it run rich.

[GMFWDFAN]

Would the FPR cause the car to start and die repeatedly? Sometimes mine refuses to start and stay running unless I give it some gas as I start it.

<sorry for the minor hijack>

[rixGAphx]

Originally posted by GMFWDFAN
Would the FPR cause the car to start and die repeatedly? Sometimes mine refuses to start and stay running unless I give it some gas as I start it.When you push your foot on the gas pedal of a fuel-injected engine, you are not 'giving it some gas'.

You are giving it a lot of AIR, since the gas pedal ONLY operates the throttle plate.

In the old days of carburetors, pressing the gas pedal:
* Opened the throttle plate (like in FI); and,
* Pushed a little 'accelerator pump (in the side of the carb) that DID 'give it some gas'.
But that terminology no longer applies, with FI engines.

Instead, on the side of the FI throttle body, there's an electronic sensor called the TPS, Throttle Position Sensor.
This detects how far open the throttle has been pushed (by your foot and the cable), and it tells the PCM (Powertrain Control Module, you engine-tranny 'puter).
Then it is the PCM that decides whether to 'give the engine some gas', based on the TPS, the O2 sensor, and many other factors.

This isn't just splitting hairs and definitions, it's an important distinction.
An GMFWDFAN, you're right in your diagnosis, if for the wrong reason.
Your intake plenum is probably 'flooded' with gas that has leaked into it from the faulty FPR.
The engine won't 'fire' becasue the Air-Fuel mixture is too rich.
By stepping on the gas pedal and opening the throttle, you are allowing more AIR into the engine, thereby reducing the richness of the A-F mixture and allowing the engine to run.
* * *

On an 8-year old engine, the FPR is definitely suspect.
But I wold do a couple more tests (especially the 'sniff' test, and a fuel pressure test) before throwing $50 at a new part.

Hope this helps,
-Rick

[GMFWDFAN]

^^It did. Thank you. :)