'97 4.3 S10 bogging problem....FPR was bad, and inj. o-rings - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-27-2007, 01:05 PM   #11
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Would this system be the Central Port Injection system?

These are picky at the very least..

I do agree, check the fuel pressure and see if its within specs

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Old 03-27-2007, 01:11 PM   #12
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Yeah its the 96+ CSFI injection. I had someone tell me that if it was going bad at all, it would trip a CEL, so far everyone has told me to check the fuel pressure, and make sure the knock sensor wire isnt touching a spark plug wire.
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Old 03-27-2007, 02:38 PM   #13
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Does the CTS have anything to do with the fueling? Just wondering if the sensor could be bad and that is why it runs better unplugged versus plugged in? Or there is some other problem and the unplugged sensor provides a band-aid for it because of the condition mode it forces the computer to go into? I'm just tossing ideas out, I really have litle idea how much of a role the cts plays other than a cold/warm/hot engine monitor.
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Old 03-27-2007, 03:29 PM   #14
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I figured that the CTS is good, since it isn't tripping a check engine light. And yes, the PCM'* CTS does play a factor in how much fuel the engine gets, it rates it off the engine temp. In fact, I am going to unplug the CTS and see how it runs.
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Old 03-27-2007, 03:38 PM   #15
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If the CTS helps determine how much fuel the motor gets, it might be unplugged to add fueling. If fueling is an issue..that would be a cheater way to get it running...sort of.

Similar to how the bonne defaults to like 40F if the IAT is unplugged.
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Old 03-27-2007, 03:46 PM   #16
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Well I unplugged the CTS, it runs much better by far, but still stutters slighty. That has to be the seeping fuel line. Guess I am going to go pick a new CTS up.
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Old 03-27-2007, 05:58 PM   #17
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Replaced the CTS. Runs slightly better, no CEL. Now its narrowed down to the fuel pressure/seeping line.
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Old 03-27-2007, 06:05 PM   #18
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Colder engines require more fuel. CTS pulls down the voltage more in high heat.

Basically disconnecting the CTS tells the PCM the engine is cold as h*ll. The PCM adjusts fuel accordingly.
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Old 03-29-2007, 12:22 PM   #19
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I'm gonna bump this to the top for today, as the fuel pressure is gonna be tested.
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Old 03-29-2007, 02:58 PM   #20
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Bringing you back to the top, how'* that pressure looking?
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