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This engine has a surge; AT 35-45mph,it's a bit more prounounced, not as bad, but still there at 60mph. As the tach goes up some, then down, so does the motor, up then back down, etc.Any ideas?

I have replaced, the catalytic converters, plugs, wires, distributor and rotor. About six years ago, the fuel module was changed along with fuel filter. Check engine light stays on, no flickering.

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Lawrence Oravetz

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Posted on Feb 09, 2016

Lawrence Oravetz

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Run a diagnostic test to see what codes come up. That will give you a place to start.

Claude Kayser

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Posted on Feb 09, 2016

Claude Kayser

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Tachometer not working on my 95 Toyota pickup 4x4 jumping up and down

bad tach, seems .
bad tach, or bad wires to it or power to it bad.
i dont know what engine option you have
but most use the ignitor signal to do this.
later about 1996 the ECU uses CKP sensor to run the tach directly
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it only has 3 wires.
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Engine surge at 60 mph

on flat ground? 60mph.
my guess, is, its running lean.
use a scan tool (real no useless code readers)
and look for closed loopstatus at 60mph. and idle.
if its not going to CL, status, that IS the top symptoms.
and LTFT, (long term fuel trim)
+5% Is typical, +40% is lean.

lean is caused by many things, sorry more tests.
one, is low fuel pressure.

(or under reported, air , for any reasons. MAP or MAF based engines)
under reported, caused, lean.
in closed loop this is corrected.
at wide open throttle on hill if power is low, that might be low fuel pressures , so does it do that?

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COULD BE GROUND PROBLEMS OR THE TACH GOING BAD.EVEN THOUGH CAR SEEMS TO BE RUNNING GOOD IDLING GOOD.SOME TIMES A SPARK PLUG MISFIRE.CAUSING A LITTLE ROUGH IDLING CAUSING TACH NEEDLE TO GO CRAZY.I SEEN ALTERNATOR WITH VOLTAGE REGULATOR GOING BAD CAUSE A POWER SURGE CAUSING HEAD LIGHTS TO DIM A LITTLE THEN BRIGHT WHILE ENGINE IDLING.THIS WILL CAUSE TACH METER NEEDLE BOUNCE AROUND ALSO.

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This engine has a surge; AT 35-45mph,it's a bit more prounounced, not as bad, but still there at 60mph. As the tach goes up some, then down, so does the motor, up then back down, etc.Any ideas?

2 Answers

Lawrence Oravetz

Claude Kayser

Surging While Driving Between 40 and 50 MPH : Chrysler ...

Enginge surges RPMS drop while driving [Archive] - Chevy ...

Hesitation and bucking on acceleration - F150online Forums

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Trustworthy Expert Solutions

This engine has a surge; AT 35-45mph,it's a bit more prounounced, not as bad, but still there at 60mph. As the tach goes up some, then down, so does the motor, up then back down, etc.Any ideas?

2 Answers

Lawrence Oravetz

Claude Kayser

Surging While Driving Between 40 and 50 MPH : Chrysler ...

Enginge surges RPMS drop while driving [Archive] - Chevy ...

Hesitation and bucking on acceleration - F150online Forums

Add Your Answer

Attachments: Added items

Related Questions:

Tachometer not working on my 95 Toyota pickup 4x4 jumping up and down

Engine surge at 60 mph

2004 ford freestar rumbling noise as I drive down the road at about 45-60mph - it sounds and feels a bit like I hit a rumble strip but it is coming from the engine

Why does engine light starts blinking at 60mph in a F-150 5.4 triton?

Roaring in the front end of my 2004 Chevy Trailblazer 4x4

My 99 alero GL runs great...85,000

Engine surge at idle 1992 honda accord. tach.varies up & down about 200 rpm. pls help!

I HAVE A '88 OLDS CALAIS WITH THE 2.3 4 CYL ENGINE. THE ENGINE WILL START TO SURGE AND WILL NOT IDLE AND EVEN CUT OFF WHEN SLOWING DOWN. AT THE SAME TIME THE SPEEDOMETER WILL STOP WORKING AND THE NEEDLE...

Tach surges in 2003 dodge dakoda

I have a 98 grand prix 3.8L and sometimes it's hard to start. then sometimes going down the road the tach goes to zero and the speedometer starts swinging while the car is trying to stall.

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Cars & Trucks

Tachometer not working on my 95 Toyota pickup 4x4 jumping up and down

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