94 Altima stumbles wont accelerate

[nelburg]

I cant get the altima to accelerate. It stumbles Knocks and bucks? I get No Error codes just 55 Timing Mark is on 18 degrees. Whats up with this thing?

[ultimatuc]

pull your distributer and check for oil in it. this is a problem w/ first gens..

good luck

[SLOW KA_]

EGR valve possibly...Intake manifold leak...

[Asleep Altima]

keep it simple and check the things first that cost no money. check for loose wires, loose or torn vacuum lines and make sure your fuel filter is not plugged. definitely check the distributor and cap and also look for spark plug wires that may not be firing, now would be a good time to pull the sparkplugs and make sure that they are firing also.

[nelburg]

All new Cap Plugs and wires no vac leaks no Oil in cap Has me baffled?

[Asleep Altima]

still no codes on the ecu?

[nelburg]

NO Just 55

[Asleep Altima]

set your timing to 20. if the engine will idle, get out a spray bottle and wet down all of the vacuum lines one by one. if the idle changes any way what so ever, then you have a leak. im still trying to keep it simple for you... the thing about vacuum leaks though, the engine will usually idle higher than normal. have you checked all of your electrical connections to see if any are loose?

[NISTECH]

is it instantaniously not throttling up or will it accel for a bit then fall on its face? Vaccum leaks dont usually stop it from accel unless the leak was so bad it wont even idle. check your MAF or the air ducting between it and the throttle body maybe the tube is split and opens up when the motor torques?

[nelburg]

The car warms up fine! Once you hit the accellerator it instantly falls off. You can idle in drive and it will move. Step on the gas and it stumbles backfires very lightly. I pulled the air duct and maf sensor there was a little corrosive green stuff. Cleaned it up put back together still the same.

[NISTECH]

where is the "poping" coming from? the exhaust or the intake? if its intake I think you have a lack of fuel which could be due to an improper airflow meter signal to the ecm. Find out wher ethe poping is coming from first.

[nelburg]

It,s the Exhaust side I checked tps good maf good signal

[nelburg]

Checked all possible items I think Injectors are the answer? I pulled all four and they look alright but there gritty anyway to test them? One bill a each is pretty steep!

[NISTECH]

do a voltage check on the maf. and pay close attention to the voltage drop on the ground wire. should be less then .2v

[nelburg]

Did this and It checked out

[NISTECH]

what were your readings on it? all three wires at idle?

[nelburg]

Disconected Orange Wire 12.42 Volts small white 12.42 volts. Started Backprobed at Idle small orange 1.48 volt at highest acc I can get without killing the engine 2.60 volts. small white 0.01

[nelburg]

How Many LBS Vac. should I find? disconnected vacume booster and hooked up vac Gauge.

[NISTECH]

about 20 at idle. Check all three of the wires with it connected and idleing and post just those numbers. You should be posting a voltage for each wire.

[nelburg]

OK Orarge Wire 14.23V White center 0.01V Small Orange 1.23V

[NISTECH]

thats good readings for an airflow. maybe signal[1.23] might be very slightly low but certainly not low enough to cause your problem.

get a fuel pressure gauge on it and see what fuel pressure is at idle and what it does on accel.

[nelburg]

Put Fuel Pressure Gauge on about 40. Can't get enough off idle to make it change that much. It looks like 45lbs not the best gauge. When I shut it off Pressure bleeds off. I think It's suppose to hold for a while isn't it? Again could be the gauge. Fuel regulator seems alright has vacume to it and fuel Pressure go's down when vacume is applied. Still stumped?

[NISTECH]

it should not bleed off when the key is turned off. but the fact the pressure goes up when you open the throttle says its not due to lack of fuel pressure.

Couple more things you need to check. go back to the distributor cap pull it off remove the rotor then pull the black cover below that off. make absolute sure there is no oil in there.

pul the plug wires out of the wells and make sure there is no water or oil in those tubes that could cause your spark to arch the tubes instead of firing the plugs.

[NISTECH]

try this little trick to for intrest porposes. set up your airflow meter connector so you can easily pull it off while the car is runing. at idle pull it off see what the engine does if it continues to run try to rev the engine up. lets see if the engine reacts EXACTLY the same or if it will rev but takes a couple seconds to respond rather then die. rev it gently let the computer compensate for the lack of input from airflow meter. does it respond differently and achive an accel?

[nelburg]

Now I'm getting somewhere! Pulled cap first time around found no oil. Didn't dig deep enough. This time Pulled cover under roter found five Quarts! . Just kidding! Now what? Oil everywhere! My second reply I recieved said look for Oil under cap but I didn't see any. Like I said didn't dig deep enough. I Thank Ultimatuk For the info!

[NISTECH]

you need a distributor. There is no reseal kit available for it.

[nelburg]

Installed new distributor car ran great. You Guys Rock Thanks for the Help:)

[QX4ME]

That is the same thing happened to my 94 Altima two years ago.

Now I have another intermittent problem. The engine turns over just fine but does not start at all. Take no notice of it and start it a few hours later. It starts right away. Had this intermittent starting problem for a few times. Once it starts, I don't see any problem, idle, various speed, A/C on and off, shifter on D, N, N or P, etc.

Anybody has any idea where to check and how?

Thanks in advance.

[NISTECH]

do you have a check engine light on or any codes stored? does it smell flooded at all?

[QX4ME]

I'll ask my dad who had this problem, to see if "check engine light" came on. When I started the car it started right away, no flooded smell at all.

By the way the car passed smog check a week ago, without any repair or adjustment.