hesitation and now vtec stopped working
11-23-2007, 10:02 AM
#1
Registered User
Thread Starter
Join Date: Nov 2007
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
hesitation and now vtec stopped working
a week ago i my S started hesitating from idle to 3K rpm. it almost sounds like its backfiring while i accelerate at WOT from idle to 3k. i did the map wack, ECU reset and nothing helped. so i changed out my MAP with my buddies MAP and still the same problems. now sometimes when it first reaches 3 bars and is warmed up it will hesitate all the way to red line, and vtec sounds like crap. so i bought some throttle body cleaner and sprayed out my throttle body. the hesitation goes away for about 1 min. then the popping and hesitation comes back. so i tried spraying it out again and now my vtec doesn't work at all. the car shuts down at 6500 rpms. No check engine light as ever come on during this whole time so im stumped. any help would be great. i live in norfolk, VA if anybody wants to take a look. the car is completely stock besides an intake. its a 2000 with 80000 miles and i have run 93 octane for months now. i also run royal purple 10W 30, and just ran a thing of lucas fuel cleaner through the engine. and nothing has helped.
11-23-2007, 10:13 AM
#4
Registered User
Join Date: Sep 2007
Posts: 147
Likes: 0
Received 0 Likes
on
0 Posts
i just changed the oil two weeks ago. also i pulled out each of my coils, what am i looking for. they seemed ok to me but maybe i was wrong. they all had alittle bit of crust on the tip where they meet the spark plug. i also pulled the plugs they where a little white i am ordering some new NGK's do i want the plantuim or iridium?
11-23-2007, 10:29 AM
#6
Registered User
Join Date: Jan 2007
Location: Tampa, FL
Posts: 2,683
Likes: 0
Received 0 Likes
on
0 Posts
Well, you can try to change the plugs and see if it works. But when i say check the coil packs im meaning one could be just plain out broken where you would need to actually replace it. does the car sound like its misfiring?
Trending Topics
11-23-2007, 11:37 AM
#9
Former Moderator
Double check your oil level. If it is very low, then VTEC will not kick in.
For the stumbling, you may need to do more than spray carb cleaner in the TB. You may need to remove the TB and clean the backside as well. There is a small passage that takes air to the MAP that can get restricted.
Another thing that can keep the car from revving is a blocked exhaust...usually the cat. But I don't recall that causing stumbling...usually it just feels like the car is running out of steam early.
Stumbling can also be caused by by bad injectors, but that usually throws a CEL code.
Some have also found that electronic add-ons that plug into the ecu can cause stumbling if a spliced connection is gounding out.
For the stumbling, you may need to do more than spray carb cleaner in the TB. You may need to remove the TB and clean the backside as well. There is a small passage that takes air to the MAP that can get restricted.
Another thing that can keep the car from revving is a blocked exhaust...usually the cat. But I don't recall that causing stumbling...usually it just feels like the car is running out of steam early.
Stumbling can also be caused by by bad injectors, but that usually throws a CEL code.
Some have also found that electronic add-ons that plug into the ecu can cause stumbling if a spliced connection is gounding out.
11-23-2007, 11:52 AM
#10
Registered User
Join Date: Sep 2007
Location: Bay Area - killa kali
Posts: 117
Likes: 0
Received 0 Likes
on
0 Posts
while ur at it; check if u have oil in ur spark plug, my plug seals were old and brittle which caused a crack in it, then oil started to leak in..causing my car to run like shit, it's a very easy fix; just pop off the valve cover and swap in new ones..btw ur symtom sounds very much like mine..i went ahead and changed the pcv, new coilpacks, new valve cover gasket, new spark plug seals now my car is back to normal..running strong at 115k miles..hope this helps