loss of power

[poboy536]

I have a 1993 D21 KA24e motor; 2wd. It has run like a top for the last year, plenty of power (within reason) and all of a sudden it just started bogging down when you give it gas to go. The more gas you give it, the slower it will go. It feels like the timing is retarded, but it is advanced as the distributor will allow. I have replaced: plugs; rotor; cap; wires; fuel filter; changed oil; cleaned throttle body and checked all wires, cant find anything wrong. I has 185,000 miles, doesn't smoke idles relatively smooth(normal) and up to about half throttle it will pick up. If I floor it from a dead stop, Big Show could probably keep it from moving if he held the tailgate. Wont spin tires on wet asphalt even now. If someone has solved a puzzle like this I would be grateful for an answer before it gets me runover.

[street_rulerr]

make sure the rotor didnt come loose. had the screw back out once and had a really similar problem.

if you had a dead cylinder, like a bad plug or wire it would run incredibly rough and not just sputter. thus id lean towards really backed off ignition timing somehow.

[poboy536]

update... took the seat out and did the diagnostic test and got a 55 several times so its not showing any error codes. It is across the board loss at all rpms. If you want to go you have to make it downshift or it will it will just go blahhhh. Of everything I replaced trying to fix it, never phased it in any way.

[alabama_lowlife]

Have you checked the timing with a timing light? Should be at 10 degrees BTDC. It's not something that should suddenly change, but the fact that it's advanced as far as the distributor will allow tells me it's not set correctly.

[ahardb0dy]

agree the distributor should not be adjusted all the way to one side.

What plugs and wires did you use? Had a problem on my former sentra with auto parts store wires, car would bog like crazy, replaced the plug wires with OEM and it never did it again.

[Fanophins]

O2 sensor will go bad without throwing codes a lot. Since it has the last say as far as spark and fuel delivery.... Plus if it hasn't been change in a while it's probably toasted. Good Luck!!!

[street_rulerr]

frankly we dont know about ignition timing yet and thats king here.

[Reserector]

Vacuum leak is my first guess. If it has a leak, it won't build vacuum near idle. That means it will have more air than it should, making the mixture lean.

FWIW, the spark has to be retarded at low rpms to create the torque you need for acceleration. As RPMs rise, it advances so it can rev out.

[IssaNissan]

Originally Posted by alabama_lowlife

Have you checked the timing with a timing light? Should be at 10 degrees BTDC. It's not something that should suddenly change, but the fact that it's advanced as far as the distributor will allow tells me it's not set correctly.

Bama made the same suggestion to me back in the day, and I played with this and that for weeks, to find in the end,,,,,my timing chain jumped a few teeth and caused me to have to fully advance my distributor.

But when it jumped the last time,,,,,I could advance no more,,,,and ended up doing a timing chain job.

PS,,,,,,,Your issues sound identical to mine,,,,,but you need to get a timing light on it ASAP before your valves kiss your piston tops. I also had bad chain rattle from destroyed guides.

[poboy536]

Originally Posted by alabama_lowlife

Have you checked the timing with a timing light? Should be at 10 degrees BTDC. It's not something that should suddenly change, but the fact that it's advanced as far as the distributor will allow tells me it's not set correctly.

I honestly cant find a place to time it. I agree it should not be advanced all the way, but it wasn't too much time it ran great. Can the timing chan be stretching and taking time out of it? Oh, I can scratch MAF sensor off the list wasn't that either. Someone said O2 sensor... going to look into that.