http://www.youtube.com/watch?v=24RYuivc5R0
This is a 1992 Tempo GL (Vulcan V6, ATX transaxle)
I took this video with the car set in Neutral, as you can see the tachometer needle becomes unstable near 3,000 rpms, this is more evident when the car is in motion and it also make the car acceleration unstable, I have no clue why this is happening!
After the 3,000 rpms threshold is reached the engine again regains power and can go at top speed.
Does this possibly have to do with the MAF or TPS sensors?
Does anyone have an idea of what's happening?
2007-11-12 09:47:06 · 10 answers · asked by El_Walrus 3 in Cars & Transportation ➔ Maintenance & Repairs
The car has been recently tuned up ( 2 weeks ago), fuel filter and spark plugs were also replaced, it's fuel injected.
I'll check the distributor and cables, then the TPS
2007-11-12 10:31:48 · update #1
instead of just throwing parts at it and costing you more in the long run take the car in and have it put on an engine analyzer to find out the problem.
2007-11-12 12:05:05 · answer #1 · answered by mister ss 7 · 0⤊ 0⤋
Over 3000 is fantastic. basically stay below the 'redline'- this is the crimson area close to the appropriate of the tachomoter. many of the time basically tooling honestly around city, you don''t ought to exceed 3000rpm. The engine makes extra means at greater rpm, so in case you wat to improve up rapid, enable the engine turn swifter earlier you shift. you will experience the engine unexpectedly 'awaken' and make so lots extra means above 4000. A 'rev-limiter' gadget will cut back the spark and forestall engine harm in case you get to the crimson-line rpm. Revving it greater than mandatory each and all the time will cut back your gas mileage. yet you moreover would do not prefer to shift too early and bathroom the engine too low going into the subsequent equipment.
2017-01-05 09:03:01 · answer #2 · answered by ? 3 · 0⤊ 0⤋
I would guess it to be a timing problem. Since it works good after the hump it would not be a gas filter.Crank or Cam position sensor is suspect.Possibly a TPS.As the speed increases the timing advances. In your case I dont think you are getting advance until 3000 rpm. Hope this helps.
2007-11-12 10:23:32 · answer #3 · answered by the pump guy 4 · 0⤊ 1⤋
Not just the TPS can cause that problem some times i have seen just one injector not squirting properly can cause this similar problem!
Also check airflow meter and check the Ht leads and plugs condition.
The condition of the spark plugs can tell a lot about whats going on in the combustion chamber.... Gud luck.
2007-11-12 10:40:05 · answer #4 · answered by devlishly_holy 2 · 0⤊ 1⤋
seams as though the car isnt getting enough fuel have you tried the fuel filter? if you have tried the fuel filter i would check the coil maybe one of your spark plug wires is arching and causing that fluctuation otherwise it could be spark plugs try those before sensors sensors get very expensive if you are just guessing what it could be.
2007-11-12 09:57:08 · answer #5 · answered by jay 3 · 0⤊ 1⤋
Throttle position sensor is where I would start, the MAF would have it (as a rule) with difficult starting and rough running at lower RPM's
2007-11-12 09:55:00 · answer #6 · answered by Michael H 7 · 0⤊ 1⤋
Possibly sensors, possibly a vaccuum hose if it is not fuel injected and is carbeurated. It could be quite hard to diagnose.
2007-11-12 09:52:34 · answer #7 · answered by crackedhead 2 · 0⤊ 0⤋
mess up engine get tune up and new pcv valve
2007-11-12 10:06:58 · answer #8 · answered by David 2 · 0⤊ 1⤋
My guess is distributor is faulty.
2007-11-12 10:12:07 · answer #9 · answered by jumbobret 6 · 0⤊ 1⤋
its the egr valve
2007-11-12 10:31:28 · answer #10 · answered by 2Tall 2 · 0⤊ 1⤋