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Bad Hesitation

T

Tate

New member
So if I'm driving the GTP like a normal person, not a problem with it. But, if I get on it it wants to buck and cut out real bad. No check engine lights pop up but every time it will do it. If I get off of it and start driving normal again no issues. Also, I'm still having a problem with really long cranking before it starts after it sit for longer than 20 minutes because I've lost prime. I've changed the FPR and it still does it. Is this a fuel pump taking a crap on me?
Tate
 


Just changed plugs/wires and all filters 5k miles ago. No cat has a 3" hatless DP. Mods are FWI,1.9s,PLOG,3" DP, 3.4 pulley, Tuned PCM.
Tate
 
As far as the running poor under WOT clean the maf and TB. And the long crank, did you ever change the fuel pump? It could be a clogging fuel filter.
 


I changed the fuel filter the same time as other tune up stuff, and just cleaned MAF and throttle body about 1k miles ago. Also stock fuel pump, car has 164k miles on it.
Tate
 
No codes at all. That's what is confusing me. Now, I haven't stayed in it to long once it started doing it. But I did make it repeat the symptoms about 4 times in a row for about 2 seconds each time before I let out of it. It doesn't matter if it downshifts WOT or going from a stop WOT. Once I get to about 3k RPMs it bucks like it's cutting all power off and on.
Tate
 


Did it all at the same time. All mods and maintenance has been done at same time about 5k miles ago except cleaning MAF and throttle body that was just done, this just started today on the way home. Well the losing prime has been ongoing for 4 months now.
 
I understand but were the new plugs in before you installed the PLOG or after? The reason I'm asking is because I decided to leave my plugs in and do my plog and because of that I cracked a plug. You may not even see a crack either but they will crack. I had no codes either. just the front plugs obviously
 
The PLOG was on before my plugs were back in the car. Plugs and wires was one of the last things I did.
Tate
 


Check the vacuum hose directly below the sc snout! The black rubber T-fitting on my '04 GTP dry rotted and feel off. Motor wouldn't run for more that 20 seconds. And check all of the vacuum lines connected from that T on around to the other side of the motor. This did cause a CEL for me and the dreaded reduced engine power message.

My cat was clogged and spitting out silver dust particles just prior to the T issue.

I've fixed both but I'm still having the exact same hesitation/stumbling/wants-to-choke-off drama at WOT only too.

Scanned with an Aeroforce. Throttle % & voltage are fine. I'm not sure how to interpret the other values that I pulled nor what is/isn't within specs.

My GTP is basically stock BTW. Hope I could help you some.

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Car didn't miss a beat yesterday driving it. Was scanning the entire time and spark advance, timing, ST fuel trim all fine. The engine was very warm the other day when it did it so maybe I have a ICM getting ready to die on me. Who knows, I'll update if anything changes or if it repeats.
Tate
 
I had no CEL but finally pulled a specific code, P0301, misfire in cylinder #1. So, I swapped cyl 1 wire out with an old but good plug and no rough idle. Just charged all the wire with AC Delco #9746BB.

I have WOT again!!!

With the Aeroforce I could see the misfires but it wasn't telling me witch location. A few days later I got P0301 cyl 1 but still no CEL. Crazy but my baby is back.

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