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33 Posts
Hey y’all,
I’m back with the car with endless problems!
Late last month we had a bad MAP, bad IAC valve, and a dirty throttle body all at once. Replaced the MAP two weeks ago, and yesterday I replaced the IAC and deep cleaned the throttle body with TB/intake cleaner. We also used seafoam last month and I used it again today.
The outstanding issue is in the title. Check engine light is on. When car is cold started, the RPM is low and bouncing below 1 and car is shaking a bit. After I rev it to about 1.5-2, it bounces between about 1-2, then calms down and rests at its normal rate just below 1.
While driving, when I’m on a flat highway for example and feeding it gas at a consistent speed, it’ll suddenly start bucking. Like I’m hitting the littlest of speed bumps. Stops when I let off the gas.
Alternatively, sometimes I’ll be driving and feeding it gas with no issue, but when I take my foot off the gas, it bucks/shudders. Otherwise, it drives fine. RPM twitches at idle once warm but that’s it.
I’ve gotta go get the codes read again tomorrow, because it did have a fuel injector code but I can’t remember which code or which injector, and I don’t know if that particular problem went away or not. But I’m between these three things:
1. Bad fuel injector or multiple injectors (obvs)
2. Bad TPS (it looked fine and I carefully cleaned it)
3. Bad IAT sensor
4. A mix of above or something else
Regardless of what I have to replace, do y’all know if any of these HAVE to be Mopar? I’ve got a Limited and it refused to take a Denso brand IAC valve—had to buy Mopar.
Also, I know about using the bleeder valve for the fuel to depressurize, but how does one repressurize the system (if fuel injectors have to be done)?
Much thanks :’)
I’m back with the car with endless problems!
Late last month we had a bad MAP, bad IAC valve, and a dirty throttle body all at once. Replaced the MAP two weeks ago, and yesterday I replaced the IAC and deep cleaned the throttle body with TB/intake cleaner. We also used seafoam last month and I used it again today.
The outstanding issue is in the title. Check engine light is on. When car is cold started, the RPM is low and bouncing below 1 and car is shaking a bit. After I rev it to about 1.5-2, it bounces between about 1-2, then calms down and rests at its normal rate just below 1.
While driving, when I’m on a flat highway for example and feeding it gas at a consistent speed, it’ll suddenly start bucking. Like I’m hitting the littlest of speed bumps. Stops when I let off the gas.
Alternatively, sometimes I’ll be driving and feeding it gas with no issue, but when I take my foot off the gas, it bucks/shudders. Otherwise, it drives fine. RPM twitches at idle once warm but that’s it.
I’ve gotta go get the codes read again tomorrow, because it did have a fuel injector code but I can’t remember which code or which injector, and I don’t know if that particular problem went away or not. But I’m between these three things:
1. Bad fuel injector or multiple injectors (obvs)
2. Bad TPS (it looked fine and I carefully cleaned it)
3. Bad IAT sensor
4. A mix of above or something else
Regardless of what I have to replace, do y’all know if any of these HAVE to be Mopar? I’ve got a Limited and it refused to take a Denso brand IAC valve—had to buy Mopar.
Also, I know about using the bleeder valve for the fuel to depressurize, but how does one repressurize the system (if fuel injectors have to be done)?
Much thanks :’)
