This thread was saved without dates. "Around Aug 2004" is estimated from neighbouring threads.
i just threw a new distributor in my car and did a complete tune up about a month ago. when the engine is cool, it will run like none other, however when it warms up it starts to miss. sometimes it misses out pretty bad. i am thinking that the timing got advanced when i put in the new dizzy. any other ideas?
Usually timing won't make a difference in between being cold and warming up. If the timing is off, it'll be off all the time. If it's too advanced, you can usually tell because the starter will have a hard time cranking the motor over. Easiest way to tell is get a timing light and check.
Sounds like you've got a sensor going out somewhere. I'm not an expert in EFI at all, so that's where my help stops... Sorry... :kicknuts:
Ive got the same problem with mine it gets real bad when warmed up, hows the gas consumtion??
the gas consumption seems normal. it only misses when warmed up and when in acceleration.
I have same problem but it gose away then come's back it's wired.
no clue
A misfire can be caused by lack of spark, lack of fuel, lack of air, and lack of compression. Air and compression would be constant wether the car was cold or warm, and on a distributor ignition system, spark is also constant. However, on EFI, fuel changes with temperature. I'll have to agree with Joel that it's probably a sensor.
Just out of curosity, do you have all stock ignition components? I've dealt with a few vehicles where the stock coil was replaced with an aftermarket one. Stock coils sometimes only need 7-8 volts to work properly, whereas aftermarket ones usually need 12. If our cars have a ballast resistor(can't remember if they do) and you have a 12 volt coil on it, then when the coil heats up it would create enough resistance to cause a misfire. However, this is usually a more obvious problem, like the engine won't run at all when warm.
Might try a temp sensor, but I think usually the temp sensor makes it run bad when it's cold. These cars have two temp sensors both on the front part of the intake manifold. They're pretty cheap and fairly easy to replace, so it might be worth a shot...
If your temp sender is screwed your car will (probably) run well cold and badly when hot because your ecu thinks the car is still cold and is trying to run it with the choke on. I know these cars don't have actual chokes but choke settings int the ecu. Wait till it gets hot and unplug your temp sensor, If your engine starts to run funny your sensor is OK but if nothing happens its probably cooked. Hope that helps.
unlyoldnissan, where about's is the temp sensor?
Ken
Just out of curosity, do you have all stock ignition components? {QUOTE]
Yes mine has all stock components.
same here. stock ignition components
im gonna throw in another ecu that i have. i wonder if that might solve it?
i tried my other ecu and it made it worse. i did notice that when it missed, the tach dropped with it. could this be a sign that a coil is going bad? perhaps the coil that the tach is on?
give it a go,it's worth it. let's me know if work's out or not .
i switched the coils and it made a big difference for the better. try it and let me know what happens.
will do,
what if my timing is advanced so that when my engine is warmed up, the dizzy starts to over heat? this might cause it to detonate instead of miss like i thought. this cant be good.
I had a similar problem with mine, but it was more to do with the air flow sensor misbehaiving due to the 2 odd meters of intake piping. i had to tighten the coil in the sensor, and i shortened the piping which seemed to fix it! Be carefull with the coil if you decide to as its very touchy.
i did make a cai and lengthen the maf wires. you think that this might be the cause??