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Discussion Starter · #1 ·
i have a 2001 altima with about ~120k miles, oil changes at every 3-4k interval. recently had the intake manifold gasket replaced for $400 to fix a rough idle. the car no longer has a rough idle, but i got it back with a dead speedometer and odometer. they were working fine before.

and my car intermittently refuses to accelerate even at full gas. it drives fine from a complete stop, but when i've been going for a few minutes, it'll suddenly decelerate and bounce between 1.5k and 2k rpm. the engine makes the throttle sounds from 1.5k to 2k, but then it dies back down to 1.5k silent and starts revving again. all the while my foot is pushing the gas solid. but when i come to a complete stop, and accelerate again, it runs fine for another few minutes, then goes into no response mode again.

i had a CEL before and pulled the code P1126, which the guys at pepboys told me was a bad thermostat. but then a few days later the CEL turned off so i assumed it was that benchmark number of ignitions and the problem wasn't really a problem.

i'm going to take it back to the mechanic tomorrow, and hopefully he'll realize one of his workers did this because i never had these problems before. the only issue i had, which i paid him $400 to fix, was an occasional rough idle.

it seems to me whoever worked on my car broke the speedo/odo sensors in the process, or forgot to reconnect them somehow. and while reassembling the engine/drivetrain, somehow made my car worse than when i brought it in.

any help, advice, or anything would be appreciated.
 

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Discussion Starter · #3 ·
fixed

issues have been fixed.

turns out that with the 2001 altima, if the speedo/odo cables are not plugged in, the car will activate the rev limiter (i believe some people call this "limp mode") in the 3rd/4th gear, and prevent you from going faster than say 45mph.

i'm assuming this is to keep your engine from blowing up in case there's something more serious wrong with the car.

went to the mechanic and he told me the cable hadn't simply been plugged in all the way. he apologized and didn't charge me anything extra, and took full responsibility for the mishap.
 
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