when i start the car and ride off everything is fine after i slow down to make a turn or stop theres no power. car wont get over 4000rpm and it struggles to get there. any suggestions

 

try checking your maf and tps

 

is it mis-firing? Burnt or broken spark plug wire maybe?

 

You need to be more specific.

 

after stopping or slowing down power seems to disappear. will go to about 2000rpm and will take forever to get up. if i floor it it wont get up or rpm increases and speed stays the same. ill try to make a video

 

Most likely a sensor of some type...Also check you normal tune-up stuff like plugs, wires, distributor cap / rotor, fuel filter, 02 sensor, MAF connection, etc...

 

its the tps dude mine does the same exact thing. i think you can buy a rebuild kit for it just be careful when taking it apart they made the screws out of like paper and they can break just by pokin it.

 

I could be wrong, but I didn't think TPS's went out that often.

 

ive rebuilt mine twice in 200k miles

 

rebuilt? They are pretty much sealed, just replace it with a junkyard part.

to OP- try maf cleaner if there isn't a junkyard close. "MAF cleaner" ONLY carb cleaner will kill your maf.

~Alex

 

im goin to test it 2morrow. kinda pointless in rebuilding it tho. just replace. i tested my camshaft position sensor already and its fine. ? i have an 02 sensor thats not pulsing back to the ecm. does anyone think that could cause the problem?

 

You're saying that the engine speeds up, but the car doesn't? What type of tranmission do you have? Sounds like it's slipping.

 

how is it running when it is trying to reach 4000? Is it running really rough like it is missing? Maybe it is running in limp (safe) mode. You are going to have to be more detailed.

 

My first suggestion is to test your ECU for codes. Please do that first to see if anything comes up. Our cars kind of suck in that the codes don't come up that often, but you should at least check. Mine did throw a code for coolant temp sensor when that went bad.

I believe the MAF limp mode is more like 2500 or 3k rpm, so that's not likely the problem.

My guess is going to be one of your sensors, coil pack(s) or clogged cat (not that likely). Another thing to check is fuel filter and fuel lines/fuel pump. Yes, these are a lot of things to check, but your diagnosis is a little vague.

Oh, Maxitech, it says in his profile that he has a 93 SE -- that means no distributor, cap, rotor, plug wires, etc.

 

i changed the map sensor. that did a great deal of work. picks up fine now. i still dont think it where its supposed to be.

 

huh? you said it picks up fine now but it still isn't correct? so did it work or not?

 

map sensor or maf?

 

sorry maf sensor. heres the deal now. it not just lags on take off. lags until about 3000 rpm and then its gone with the wind

 

My car felt dead like that when I first got it. Felt like it didn't even move until around 3500RPM's. I replaced the MAF and it helped quite a bit (Along with the addition of a Cold Air Intake) But it still kind of felt dead in low RPM's. I didn't really do anything else to it other than normal maintenance (Oil Change, Sea Foam, Injector Cleaner, Clean IAC, MAF, EGR, etc.) Everyone swore up and down it was a bad injector, but it just went away after a few weeks or so. I think in my case the car was sitting for a while...

 

my car was sitting for a while too. years actually. im not sure if mine is bad injector or not cuz when i unplug one barely makes a difference idle. when gas is givin makes a big difference. i think mine may b clogged or so. i gave them a synthetic treatment today. see if that makes a difference

 

Be careful what you add to the fuel system...The injectors are suicidal if you live in an area with ethanol added to the gas! Treatments may do more harm than good.

 

wouldnt that be places like large cities where emissions are a big issue?

 

yeah, we don't have to worry about ethanol too much here in the South

 

Meh, ATL is big town.

 

I hate to ask a really dumb question, but my VE seems to be doing about the same thing. A new injector helped with a rough idle, but it still seems a little weak.

So, what is involved in replacing the MAF sensor? (I was going to ask what MAF stood for, but I at least googled it to find out what it is). Is there another post that anyone can refer me to?

 

The MAF is the thing on your intake assembly with the plug going into it...Try cleaning the plug and connection before replacing it...There are many used MAF's for sale out there (new ones are crazy expensive)...In fact, a lot of us keep a spare one around...

 

Is it weak in low end power[below 3500rpm]?

If it is,it may be a bad knock sensor...


Location of maf sensor[pic is of a vg,but the ve maf is in about the same area]



removal of the maf is super simple,just take a look at it..four screws/loosen a clamp/remove wire harness...done..

 

Low end power is definitely where it really struggles. In an earlier post, someone seemed to mention that a new MAF would correct that. I'd rather replace the MAF than the knock sensor, seeing that I could actually attempt the MAF.

 

Also, do the VE & VG use the same MAF?

 

I seriously doubt the maf is your issue,sounds like a bad k/s...

Well,you could bypass the k/s,but you must ABSOLUTELY run nothing but premium fuel or you will destroy your engine...all it takes is a 470k resistor in the k/s plug harness...But replacing it would be better..

Or you could drive it over to me and i will replace it for you..

 

ok ok ok. so today comes out to be the worse so far. after treatment car was running fine but now i have a dead alternator. b-4 car dieing it seemed to lag on take off again. think its because of alternator?

 

The thought had crossed my mind... Where in TN are you?

I'm assuming it is the knock sensor. Does that also cause it to lag under load? As in, at a stop, you floor it and it kind of takes its good old time thinking about going? (It's an auto)

 

Pm me on this issue when you reach 15 posts..


Yeah,when the knock sensor fails,the ecu will automatically retard the timing[to about the 3500rpm area] to protect the engine from detonation[spark knock]..the end result is a severe loss in low end power..

 

It sounds like the KS is definitely my issue, then. Thanks for the info. I'm moving on, seeing that I feel like I kind of high-jacked this thread.

I'll shoot you a PM soon.

 

im not sure what my cars problem is yet. i havnt been driving it so today i changed the transmission fluid (brownish-blackish color) and added so lucas in. i then started it up and tested. now take off is perfect.......until i stop or slow down to make a turn or wutever. wtf is going on. heres a video of take-off after a stop with the pedal to the floor. http://s6.photobucket.com/albums/y21...=VIDEO_019.flv as u see its not that great.

 

Well,after watching the video i noticed you have a gxe maxima [VG SOHC ENGINE] Not a SE....Unless you have swapped your instrument cluster out with a gxe?

 

that's an SE cluster at night, wayne.

 

if you wathced carefully you would see where the speedo goes over 125 at about 0:20. ive never seeen a gxe with that on the dash. video was shot at night tho

 

It was early,i was tired...

 

but the green glow? i heard the SE cluster ran white glow (or did I hear wrong?), so did you put green lights in, Mooze?