90. fc with idle problem (video)
02-26-12, 04:05 PM
#1
90. fc with idle problem (video)
https://www.youtube.com/watch?v=IPVH...e_gdata_player
it does the hole cold start. but as soon it finishes, it bounces. i pulled the plug from the throttle body. & it smooths out at cold start revs. 3500 rpms
it does the hole cold start. but as soon it finishes, it bounces. i pulled the plug from the throttle body. & it smooths out at cold start revs. 3500 rpms
02-26-12, 06:15 PM
#4
Alright the first thing to check is for ANY air leaks from the throttle body to the filter box. The second thing I would check is your two adjustment points on top of the upper manifold. There should be a screw directly on top of the throttle body that allows you to adjust the throttle intake. Try adjusting that lower to see if it decreases that throttle bobble.
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02-27-12, 06:53 AM
#10
Ban Peak
iTrader: (49)
Best way to check for vac leaks: Start it up and spray carb cleaner around the manifold mating surfaces and vacuum hoses. If it's sucking in unmetered air, the engine will suck in the carb cleaner at the location of the leak and speed up.
It could also be a stuck throttle plate, and is your timing correct? Did the car sit for a long time beofre you got it?
It could also be a stuck throttle plate, and is your timing correct? Did the car sit for a long time beofre you got it?
02-27-12, 01:53 PM
#16
Ban Peak
iTrader: (49)
Have you checked for vac leaks? Have you flushed the coolant?
From the video it just seems like the thermowax in your TB isn't functioning right. My car hunts like that until it's warmed up all the way.
Your throttle plates could be stuck too.
You physically need to make an attempt to work on it, taking the suggestions we've made, and tell us the results.
You keep on asking "What's wrong" and have never made a post reflecting that you've tested our suggestions. Sorry but we can't help you unless you make an attempt.
From the video it just seems like the thermowax in your TB isn't functioning right. My car hunts like that until it's warmed up all the way.
Your throttle plates could be stuck too.
You physically need to make an attempt to work on it, taking the suggestions we've made, and tell us the results.
You keep on asking "What's wrong" and have never made a post reflecting that you've tested our suggestions. Sorry but we can't help you unless you make an attempt.
02-28-12, 02:43 PM
#17
That plug you pulled is the throttle position sensor. If the car doesnt see the tps signal it ignores it and uses the maf, map, cas, and h20 temp for timing and fueling needs. The car SHOULD NOT be idling at over 2000rpms. You have a air leak somewhere, be it metered(thermowax failed open, bavc open, aws open, throttle cable binding) or an unmetered vacuum leak...and a large one at that. Ignore the 6pi and vdi right now, even of those are stuck it wont cause the problem you currently have.
02-28-12, 05:55 PM
#20
547hp at the flywheel
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its the 2 black plungers on the side of the throttle body connected to that plug you are disconnected.
http://atkinsrotary.com/store/images...91T-TPS-01.jpg
http://atkinsrotary.com/store/images...91T-TPS-01.jpg
02-28-12, 08:13 PM
#21
i tryed the curb cleaner with ever hose & seal i saw. nothing happend,still did the bounceing. coolant looks soo nasty & smells bad. gotta change it. the tps is bad, i believe because when i push down on the throttle, the rpms drop alot. but still bounce. im taking it to dave at speed1 for a rebuild/streetport anyways.
03-05-12, 07:44 AM
#24
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bad aws
My 91 NA did exactly the same thing all of a sudden. The accelerated warm up valve (aws on the driver's side of the UIM) was Stuck open or something. I just plugged up the hose and everything was fine.
