Car is Bucking During Cruise and Decel
02-04-06, 12:08 AM
#1
ROBRXRAY
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Car is Bucking During Cruise and Decel
ok here's the prob. my car 86/na has been running f**king great. bone stock, yesterday i take off from house and car acts/bucks like i'm in wrong gear for about 2blocks,then returns to normal till i stop and park for 1-2hrs. the trip was approximately 2-3 miles. so i go to leave and car starts bucking really bad and i end up driving back 20mph in 3rd gear with car acting like maybe starving for fuel. where do i start? i was considering before this to check my tps and adjust or replace but car had been running well as said before so i was waiting to get time to do that. car has new fuel filter, spark plugs/wires, alternator, starter, oil/filter? pleeez give feedback asap, thanx rob
02-04-06, 12:26 AM
#3
What's the point??
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mine does that when its down to about 3 gallons left in the tank, most likely rusted out baffles. I would change the fuel filter because its cheap and simple then follow up with other stuff
02-04-06, 10:31 AM
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Engine, Not Motor
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I edited the thread with an actually useful title...
As for your problem, first check the TPS. It may have simply died, or become unplugged.
Check ignition to make sure that you're not getting intermittant spark (loose wire or coil).
Replace the fuel filter since it's probably never been done and a clogged filter will cause this...
Then get back to us after doing the above.
As for your problem, first check the TPS. It may have simply died, or become unplugged.
Check ignition to make sure that you're not getting intermittant spark (loose wire or coil).
Replace the fuel filter since it's probably never been done and a clogged filter will cause this...
Then get back to us after doing the above.
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02-04-06, 08:19 PM
#8
AutoX Donut Maker
Originally Posted by Aaron Cake
The grounding "mod" is pointless. Just clean and service your existing grounds. Adding more is not required.
Just clean and service your existing grounds. Adding more is not required.Well of course it's pointless. That's why it ended up in the archive and manages to take care of alot of problems for people.
02-04-06, 08:27 PM
#10
If you go by the logic, "Well, it was working yesterday, so it must be fine today", nothing on a car would ever break. It's working fine from the factory, so it will work fine the next day, and the next day, etc.
Check the above listed things. I'd start with the TPS first - if it's bad, you'll get fuel cut over 1500 RPM at inopportune times.
-=Russ-=-
Check the above listed things. I'd start with the TPS first - if it's bad, you'll get fuel cut over 1500 RPM at inopportune times.
-=Russ-=-
02-04-06, 11:20 PM
#11
C-town Hustler!
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Originally Posted by Aaron Cake
The grounding "mod" is pointless. Just clean and service your existing grounds. Adding more is not required.
Just clean and service your existing grounds. Adding more is not required.and it took care of the problems,so its not pointless!!!
02-05-06, 09:39 AM
#12
Engine, Not Motor
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Originally Posted by DemonicPupil
Well of course it's pointless. That's why it ended up in the archive and manages to take care of alot of problems for people.
It's in the archives because it's an option to bandaid the problem. To FIX the problem means actually making sure the stock grounding points are in good shape (which they almost certainly are NOT).
02-05-06, 12:45 PM
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Originally Posted by Aaron Cake
It's pointless in the sense that all you need to do is fix the stock grounds. If they are working properly (and there are MANY stock ground points) then it is absolutely unnecessary to add a million more grounds.
It's in the archives because it's an option to bandaid the problem. To FIX the problem means actually making sure the stock grounding points are in good shape (which they almost certainly are NOT).
It's in the archives because it's an option to bandaid the problem. To FIX the problem means actually making sure the stock grounding points are in good shape (which they almost certainly are NOT).
thats 2 not a million and it corrected my problem
Thanks again---and thanks for the pm
02-05-06, 03:45 PM
#14
Engine, Not Motor
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You don't need to tear apart the harness to fix the stock grounds. But you will have to remove the intake manifold to get at the ECU ground properly.
If fixing the stock grounds did not work, then it means there is a problem with the harness. In that case it is prudent to fix the harness properly instead of bandaid the problem by adding more grounds.
I have NEVER had to add grounds to fix a grounding problem, and I've worked on some cars with horrendously poor wiring.
If fixing the stock grounds did not work, then it means there is a problem with the harness. In that case it is prudent to fix the harness properly instead of bandaid the problem by adding more grounds.
I have NEVER had to add grounds to fix a grounding problem, and I've worked on some cars with horrendously poor wiring.
02-05-06, 05:00 PM
#15
I'd hit it.
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Maybe try running higher octane gas. When i first bought mine it was bucking at cruise and decel, and i just thought it was something those crazy rotary engines did. When i found out you should be running higher octane for turbos i switched to 93 and the bucking stopped immediately! Of course i know yours is na and mine is turbo, but maybe its worth a try? Someone correct me if this is bad advice. 
02-05-06, 06:02 PM
#16
Engine, Not Motor
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NAs work best on low octane fuel. In fact I'm fairly sure that the TII's manual also says to use 87 octane in most cases.
If you are bucking and premium fuel fixes it, then it's probably a vacuum leak (or several).
If you are bucking and premium fuel fixes it, then it's probably a vacuum leak (or several).
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