Terrible acceleration to 3000rpms then takes off like a scalded dog???
Knuckles69
08-19-2014, 07:38 PM
Wonder if someone can point out what I'm missing here. Bought this 98 altima 2.4l automatic about a month ago and i've been trying to get the gremlin out of it since. Here's my problem: When I pull off from a green light I have terrible acceleration (whether Im lightly touching the gas OR foot to the floor), but once I hit 3000rpm the car takes off. Runs perfectly up until it shifts. The second I drop below 3000(after shift) im immediately back to that terrible acceleration until i reach 3000 again. Car idles fine in park but idle drops when I shift to drive/reverse. (not sure about neutral, i will check tonight). No check engine light on.
So far I have: replaced spark plugs(OE NGK coppers/double checked gap), replaced cap & rotor, replaced fuel filter, ran a tank of seafoam through it (skipped a tank) then a tank of Lucas fuel injector cleaner, all injectors are clicking normally, replaced air filter, cleaner MAF sensor (CRC MAF cleaner), repaired post-cat exhaust leak, and nothing has had any effect on this problem what-so-ever
Anyone have any ideas?
I've added a bottle or Lucas transmission fix to the trans: shifts smoother:thumbsup:, but had zero affect on the acceleration issue:thumbsdow, which leads me to lean away from the torque converter.
I've pulled the vacuum hose off the fuel pressure regulator to see if fuel came out. (it didnt) so i assume thats good. (is there another way to test it?)
Used 2 bottles of carb cleaner spraying around the intake manifold to check for leaks and other misc hoses. Not sucking air anywhere. And I Sharpied my coolant level on reservoir (on the chance that the intake manifold was leaking coolant). has not dropped in 500miles
Checked that O-ring on the distributor that always leaks; not leaking
Barely touching the accelerator or mashing it foot to the floor has the same results under 3000 rpm, so im doubting TPS
Car uses a timing chain instead of belt so I doubt thats been changed to throw the timing off. I'm stumped. Thought these new cars where supposed to throw a damn check engine light when something went wrong?
Car has 215000 miles on it and a grand total of $850 in it (purchase price+ parts) so id like to avoid the $250 diagnostic fee if possible. Ive put 500 miles on it since I got it and it is 100% consistent at 3000rpm, every single time.
All thoughts, ideas, and half assed guesses are welcome! thanks guys.
So far I have: replaced spark plugs(OE NGK coppers/double checked gap), replaced cap & rotor, replaced fuel filter, ran a tank of seafoam through it (skipped a tank) then a tank of Lucas fuel injector cleaner, all injectors are clicking normally, replaced air filter, cleaner MAF sensor (CRC MAF cleaner), repaired post-cat exhaust leak, and nothing has had any effect on this problem what-so-ever
Anyone have any ideas?
I've added a bottle or Lucas transmission fix to the trans: shifts smoother:thumbsup:, but had zero affect on the acceleration issue:thumbsdow, which leads me to lean away from the torque converter.
I've pulled the vacuum hose off the fuel pressure regulator to see if fuel came out. (it didnt) so i assume thats good. (is there another way to test it?)
Used 2 bottles of carb cleaner spraying around the intake manifold to check for leaks and other misc hoses. Not sucking air anywhere. And I Sharpied my coolant level on reservoir (on the chance that the intake manifold was leaking coolant). has not dropped in 500miles
Checked that O-ring on the distributor that always leaks; not leaking
Barely touching the accelerator or mashing it foot to the floor has the same results under 3000 rpm, so im doubting TPS
Car uses a timing chain instead of belt so I doubt thats been changed to throw the timing off. I'm stumped. Thought these new cars where supposed to throw a damn check engine light when something went wrong?
Car has 215000 miles on it and a grand total of $850 in it (purchase price+ parts) so id like to avoid the $250 diagnostic fee if possible. Ive put 500 miles on it since I got it and it is 100% consistent at 3000rpm, every single time.
All thoughts, ideas, and half assed guesses are welcome! thanks guys.
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