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1991 Volvo 940SE Speedo Problem

Speedo needle stays at zero or erratically and violently swings between 60 & 80 after the car has accelerated from 0 to 70. After the car stops, the needle returns to 0 but quickly jumps to 40 for an instant then drops back down to zero again. Nothing I do will correct the problem. This is the main pattern I've noticed. There are other patterns, but the needle never stays steady to read the correct speed.

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  • Cars & Trucks Master
  • 1,013 Answers

The symptoms you describe point to a loose or cracked speedometer cable. The cable likely needs to be replaced.

Posted on Apr 15, 2014

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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Levyathos
  • 60 Answers

SOURCE: Transmission

Hi. I am the owner of a 2007 camry LE. And let me tell you, i still experience the same behaviors with my car as well. The erratic 30-40 mph shifting is either up or downshifting due to the innovation of the ECT-i (Electronic Controlled Transmission with intelligence) meaning the car has two ECUs, one for the engine and one solely for the transmission. Altough the engine recognizes the car is going at these speeds, the transm. keeps the highest gear (5th for 4 cyl engines, 6th for the V6 engine) at low revs, ergo, producing the rumbling vibration you hate the most. Mine has 40,000mi and never took it to a dealership, it is not as bad as it was at the begining. The Cruise Control situation, i have the same problem and is not gonna change, due to the same ECUs situation, both of them conflicting wether it is fast or slow, rich or lean, up or downshift, until they get a program solution. All i do is: engage cruise ctrl while on straightways and disengage when coming to an uphill. Other than that, I think is the best investment I've ever made. Just ordered a set of wheels for it this week. Hope this will help.

Posted on Aug 22, 2008

  • 184 Answers

SOURCE: Rev counter needle

HAVE YOU TRIED DISCONNECTING THE BATTERY & RECONNECTING THE BATTERY THIS SHOULD RESET REV COUNTER.

Posted on Jan 04, 2009

emissionwiz
  • 78238 Answers

SOURCE: s40 's' reg volvo no power on acceleration

do u have a check engine light? have the fuel pressure tested and also have the fuel regulator tested.

Posted on May 13, 2009

  • 1 Answer

SOURCE: speedometer erratic/intermittent

I don't know what is causing this problem, but I know phil140701's answer is completely wrong on two counts. First, 740 Volvos starting at least in 1986 have electronic speedometers and no cable. There is an electronic sensor on the differential which sends a signal to the speedometer cluster. Second, if it were strictly mechanical with a cable then the voltage regulator could have no effect on it at all.

Posted on Sep 01, 2009

ssantin1
  • 52 Answers

SOURCE: 98 Camry LE V6 Speedometer/Odometer and transmission shifting issue

That type of speedometer has a sensor and plastic gear attached to it in the trans. Most of the time the gear is worn out replace the gear and all should be fine.

Posted on Feb 17, 2013

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2 Answers

Why is the speedometer reading erratically?


Depending on the type an year vehicle an the electronics on the car , the instrument cluster could be at fault ! The stepper motor that moves the speedo could be the problem if a GM product ! As far as the speed sensor goes a few other things wouldn't work very well if it were bad an the check engine light would be on more then likely because this is an input to the PCM - engine computer ! The transmission would shift erratically !
Speedometer
The IPC displays the vehicle speed based on the vehicle speed signal from the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The IPC uses the vehicle speed signal circuit from the PCM in order to calculate the vehicle speed. The speedometer defaults to 0 km/h (0 mph) if a malfunction in the vehicle speed signal circuit exists.
So I would say the instrument cluster is bad !

Jun 10, 2015 | Cars & Trucks

2 Answers

1991 Volvo 940SE Turbo headlights shut off, sometimes come back on after a while. Hi-beams work fine. My headlights work fine, then suddenly they'll both go out, and I have to switch to hi-beams. After...


the lights relay is located below the radio, you can get to the relay by removing the ash tray. the relay is red and round and is on the same panel as the fuses. Good luck

Jun 16, 2009 | 1994 Volvo 940

2 Answers

Flatlining at 3000 RPM


maybe the cam timing is off. If the engine was torn down and reassembled wrong, that would do it. Connect a vacuum gauge to the intake manifold and see what you get for vacuum readings.
It should be about 17 inches at idle. And, it should be steady.

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  1. NORMAL READING: Needle between 51-74 kPa (15-22 in-Hg) and holding steady.
  1. NORMAL READING DURING RAPID ACCELERATION AND DECELERATION: When engine is rapidly accelerated (dotted needle), needle will drop to a low (not to zero) reading. When throttle is suddenly released, the needle will snap back up to a higher than normal figure.
  1. NORMAL FOR HIGH-LIFT CAMSHAFT WITH LARGE OVERLAP: Needle will register as low as 51 kPa (15 in-Hg) but will be relatively steady. Some oscillation is normal.
  1. WORN RINGS OR DILUTED OIL: When engine is accelerated (dotted needle), needle drops to 0 kPa (0 in-Hg). Upon deceleration, needle runs slightly above 74 kPa (22 in-Hg).
  1. STICKING VALVES: When the needle (dotted) remains steady at a normal vacuum but occasionally flicks (sharp, fast movement) down and back about 13 kPa (4 in-Hg), one or more valves may be sticking.
  1. BURNED OR WARPED VALVES: A regular, evenly-spaced, downscale flicking of the needle indicates one or more burned or warped valves. Insufficient hydraulic valve tappet clearance will also cause this reaction.
  1. POOR VALVE SEATING: A small but regular downscale flicking can mean one or more valves are not seating.
  1. WORN VALVE GUIDES: When the needle oscillates (swings back and forth) over about a 13 kPa (4 in-Hg) range at idle speed the valve guides could be worn. As engine speed increases, needle will become steady if guides are responsible.
  1. WEAK VALVE SPRINGS: When the needle oscillation becomes more violent as engine rpm is increased, weak valve springs (6513) are indicated. The reading at idle could be relatively steady.
  1. LATE VALVE TIMING: A steady but low reading could be caused by late valve timing.
  1. IGNITION TIMING RETARDING: Retarded ignition timing will produce a steady but somewhat low reading.
  1. INSUFFICIENT SPARK PLUG GAP: When spark plugs (12405) are gapped too close, a regular, small pulsation of the needle can occur.
  1. INTAKE LEAK: A low, steady reading which can be caused by an intake manifold or throttle body gasket leak.
  1. BLOWN HEAD GASKET: A regular drop of fair magnitude can be caused by a blown head gasket (6051) or warped cylinder head-to-cylinder block surface.
  1. RESTRICTED EXHAUST SYSTEM: When the engine is first started and is idled, the reading may be normal but as the engine rpm is increased, the back pressure caused by a clogged muffler, kinked tailpipe or other concerns, will cause the needle to slowly drop to 0 kPa (0 in-Hg). The needle then may slowly rise. Excessive exhaust clogging will cause the needle to drop to a low point even if the engine is only idling.
    When vacuum leaks are indicated, search out and correct the cause. Excess air leaking into the system will upset the fuel mixture and cause concerns such as rough idle, missing on acceleration or burned valves. If the leak exists in an accessory unit such as the power brake booster (2005), the unit will not function correctly. ALWAYS FIX VACUUM LEAKS.

May 25, 2009 | 1994 Ford Mustang

1 Answer

I have a 1991 volvo 940se and I'm not sure where the relays are.


IF I REMEMBER CORRECTLY THE RELAYS ARE IN THE MIDDLE CONSOLE UNDER THE RADIO. THERE SHOULD BE AN ACCESS PANEL ON THE PASSENGER SIDE. HOPE THIS HELPS. KEEP ME POSTED PLEASE. GGOD LUCK.

Apr 29, 2009 | 1991 Volvo 940

1 Answer

Rev counter needle


HAVE YOU TRIED DISCONNECTING THE BATTERY & RECONNECTING THE BATTERY THIS SHOULD RESET REV COUNTER.

Jan 04, 2009 | 2003 Ford Freestyle

2 Answers

Speedometer erratic/intermittent


I don't know what is causing this problem, but I know phil140701's answer is completely wrong on two counts. First, 740 Volvos starting at least in 1986 have electronic speedometers and no cable. There is an electronic sensor on the differential which sends a signal to the speedometer cluster. Second, if it were strictly mechanical with a cable then the voltage regulator could have no effect on it at all.

Dec 29, 2008 | 1991 Volvo 740

1 Answer

1991 pulsar speedo


speedo went to zero km, indicators in dash work opposite, taco isn't working either.

Jul 03, 2008 | 1990 Nissan Pulsar

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