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Thread: HELP!! Engine problem

  
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    mattmk4sxi's Avatar
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    HELP!! Engine problem

    was driving back from dropping my girlfreind at work this morning, was on the bypass, doing aboute 75mph in fifth gear and the car began to shudder when foot was right down, came off at the next junction to have a look and couldnt see anything wrong so i carried on home, been out again a few hours later and now im struggaling to get over 4000 rpm, when it reaches 4000 there is a loud humming noise comming from under the bonet and it sounds quite load like it does when it reaches the rev limiter, had a straight through pipe and backbox fitted 4 days ago and since then you could hear the exhaust, now all i can hear is the humming/vibrating noise comming from under the bonet and the exhaust is no where near as loud even at slow speads, could this mean there is a problem with the manifold or exhaust??? its a 52 plate mk4 astra sxi 1.6 16v, any help would be great
    thanks

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    !!UPDATE!!

    Unplugged the air flow meter while the engine was ideling and the engine diddnt cut out and the revs diddnt drop/rise at all, taking it this is the problem??
    thanks

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    Air flow metre? There isn't one on the 1.6 16v MK4's assuming you have the Z16XE engine, as this has a basic air intake temp sensor only.

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    Quote Originally Posted by nry View Post
    Air flow metre? There isn't one on the 1.6 16v MK4's assuming you have the Z16XE engine, as this has a basic air intake temp sensor only.
    any suggestion to what else it could be?

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    any lights on the dash and do they work or have they had blutak pot on the bulbs??
    N.b. any opinitons expressed above should be ignored and considered 'ramblings', under no circumstances should they be relied upon...

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    Quote Originally Posted by graeme647 View Post
    any lights on the dash and do they work or have they had blutak pot on the bulbs??
    Engine managment light is illuminated http://img515.imageshack.us/i/emlab2.jpg/ Possibly cam shaft sensor?

    Physical location

    The rotating disc of the sensor system does not necessarily have to be mounted directly on the crankshaft but can also be driven by a chain or toothed belt off the crankshaft as is the case in some Hondas where the crank position sensor is located in the distributor, effectively driven by the timing belt. Other locations include: The front of the crank on the engine block below or next to the water pump, on the main crank pulley or near the flywheel.
    [edit] Problems encountered

    Sometimes the sensor may become burnt or worn out. The most likely causes of crankshaft position sensor failure are exposure to extreme heat when you have a gasket or crank problem, corruption from oil or other engine fluids that leaked onto the sensor, or wear over a long period of time. When it goes bad, it stops transmitting the signal which contains the vital data for the ignition and other parts in the system.
    [edit] Signs of a problem

    A bad crank position sensor can worsen the way the engine idles, the pistons fire, or the acceleration behaviour. If the engine is revved up with a bad or faulty sensor, it may cause misfiring, motor vibration or backfires. Accelerating might be hesitant, and abnormal shaking during engine idle might occur. In the worst case the car may not start

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    Do the pedal test and tell us the codes (or Google them yourself!):

    http://www.astraownersclub.com/vb/sh...78&postcount=2

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    Quote Originally Posted by nry View Post
    Do the pedal test and tell us the codes (or Google them yourself!):

    http://www.astraownersclub.com/vb/sh...78&postcount=2
    got a few

    p1230 -
    p0351 -
    p0352 -
    p0353 -
    p0354 -
    p0300 -

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    coil pack gets my vote

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    that engine light in the link is the emmisions light am i wrong? get under the car and check the lambda is plugged in they sometimes pop out when changing exhaust ceentre sections

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