mistreeman

Hello All,

I just became a new registered member so please forgive my ignorance on proper protocol. I just purchased a 93 LS400 with 212,000 miles. For what I paid for it, it was a good deal. However, as I cruise down the road the engine seems to surge or have a miss. Upon slight accleration, it misses or skips. I can step on it and it seems to take off good. Supposedly, the previous owner put new plugs, distributor and rotor caps, etc. I have a bit of mechanic skills. There may be a past thread on this topic, but I did not find one. Again, I am a newbie. Just thought I would throw this out to see what ideas any of you may have. Thanks in advance!

LiCelsior

iTrader: (32)

welcome

is there a check engine light? www.lexls.com will help u alot.

mistreeman

Hey, thanks for the reply! No, there is no check engine light on. However, I have noticed that when I turn the key to the "on" position, I do not see the check engine icon light up. Could it be possible the check engine light is not working? Thanks for the link. I will check it out.

LiCelsior

iTrader: (32)

yep sounds like the bulb is out...like how mine was when i got the car.

mistreeman

Sooo...if the check engine light bulb was good, I suppose my "check engine" light would be on?!? What would you suggest I do?? Thanks!

LiCelsior

iTrader: (32)

on the website, theres a tut to take out the dash cluster...take it out and replace the bulb...make sure its out though, turn the car to "ON" and all the lights should come on.

mistreeman

OK. I will see what I can do. However, by replacing the bulb and getting the check engine light to work, how will this help with the engine miss? Can I do any trouble shooting (engine wise) to help determine what is the cause of the miss?

LiCelsior

iTrader: (32)

after the bulb is lit, u can see what code u have (check that website on how to read codes) and from there we can help you more .

mistreeman

Thank! I will pursue this and get back with the results!

damon

If you have the opportunity, I would like to see you swap AFM's (mistakenly referred to as MAF's for our cars) since it is quick & easy once you find somebody willing.

mistreeman

Damon, thanks for the suggestion. Where is the AFM located and are they all the same on the 93 model?

LiCelsior

iTrader: (32)

directly before the air filter.

mistreeman

Thanks again for the info. I have not had time to remove the instrument cluster to replace any blown CEL bulb(s). Would I just be throwing money at the problem to replace the AFM before bulb replacement? Can a fautly AFM cause and engine miss?Thanks for all your help!

LiCelsior

iTrader: (32)

it can...i suggest u finding a CL member in GA that also has a LS400 or a SC400..

vaughn37

my car has the same problem.....if i floor it from a stand still.it accelerates great......but if i am already going say around 10mph and then give it a good amount of gas it skips for a slight sec then goes good.......my engine light works and i have no codes