Question about 1991 Isuzu Trooper

3 Answers

No ht from coil. Changed crank sensor, still no HT

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  • martin311 Jun 04, 2010

    Solution I have already received is for standard points and condenser set up. As I said have replaced crank sensor so this is obviously an electronic/emc set up.

  • martin311 Jun 04, 2010

    Car was running fine apart from an occassional intermitant fault (no HT).The car finally quit completely. On checking there was all the low ignition voltages but no HT.Coil was not being switch on/off.Changed crank sensor but still no HT at HT leads/plugs.Is there an ignition amplifier on this model or only the ECM unit.

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3 Answers

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  • Isuzu Master
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I would think the ignition module would be the problem not the crank sensor..

Posted on Jun 04, 2010

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  • Isuzu Master
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Perform a compression check on the engine. If all four cylinders are low (below 100) the timing belt has probably failed. Check for spark at the spark plugs. If spark is present at the plugs, check for 12 volts at the fuel pump. Scan computer with an engne scanner and check for trouble codes.

Check for an electrical pulse at injectors while cranking. A weak crank-angle sensor could also be the cause your problem.

Keep in touch.

Posted on Jun 04, 2010

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  • Master
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Well, first at all check the ground wire to the base of the points and make sure that the gap on the points are adjusted right... and the points wire that goes out be insulated from touching the ground of the distributor body.. To check the connections try this procedure Use a test light with the (+) of the coil on one end and the negative side of the coil on the another....
the test light should be On-Off-On-Off (blinking when cranking but off when not cranked) that way we know for sure that the points and condenser are both good. High performance HT (high tension) Leads
Faulty high tension leads – (HT leads) will not cause a weaker spark they will just prevent the spark from happening so if you are having a misfire or uneven idle make sure the HT leads are in good order – flexing and bending them is often enough to damage then so make sure that they are handled carefully. A set of good quality HT leads will minimize electrical faults especially in extreme temperatures but will not in themselves increase performance.
The HT leads should have the lowest internal resistance and also provide electromagnetic shielding to prevent electrical interference with other car components such as the main engine control unit (including the radio). The lead should be matched to the voltage as the wrong size core can lead to heat problems and resistance issues. Thanks. keep updated for any more query.you can rate this solution and show your appreciation.

Posted on Jun 04, 2010

  • raj somaiya
    raj somaiya Jun 05, 2010

    In newer model there is ignition amplifier included.But in your model it has to be checked.Also you can get the ignition amplifier fitted externally by modifying the ignition system from any local car garage mechanic familiar with this job.
    Ignition Amplifier - Prices from £8.95 + Delivery.
    What is a Ignition Amplifier? An ignition amplifier device for the secondary circuit of an ignition system comprises the series connection of a spark gap having an electrode spacing of between 0.05 and 0.2 mm with a condenser. The so formed series connection is shunted to the electrodes of the spark plug. Ignition Amplifier Earth Waveform The earthing on the ignition amplifier (also referred to as the module or the igniter's) is vital to the operation of the ignition system and is often overlooked as an area for potential problems. The earth connection, if not in good condition, can cause a reduction in the primary current that will effect the current limiting (or dwell control) circuit. It is therefore vital that this important connection is tested and rectified if it is found to be outside of its operational limits. An earth return circuit can only be tested while the circuit is under load and this therefore makes continuity testing to earth with a millimeter inaccurate. As the coils primary circuit is only complete during the dwell period, this is the time that the voltage drop should be monitored. Ensure that the 'voltage ramp' does not exceed 0.5 volts. The 'flatter' the resultant waveform the better. A waveform with virtually no rise shows that the amplifier / module has a perfect earth. If the 'ramp' is too high, another earth wire can be soldered in parallel with the original earth connection will be beneficial. Amplifier and Coils They are designed to increase spark intensity on Inductive Ignition Systems. The ignition amplifier works with either or after-market ignition coils. They both will deliver a maximum 20 Volts to the coil even if the battery voltage is below 12 volts, making this ideal for Racing without an Alternator. The fully epoxy encapsulated electronics will provide trouble free life, even in the harshest environment. 

    The ignition amplifiers regulates output to remain between 18 - 20 Volts, up to 20 amps even when input voltage drops below 12 Volts and can be installation anywhere in the Engine Bay or Chassis.
    Thanks.

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