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My 1998 2.5 omega has a miss under load at low revs itook the car to a tune up garage a good one and told me that the crank sensor was faulty so i changed it but i have the same faultcan you recomend what else to do thank you.

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Sounds liie a vacunm leak. check all the little hoses.

Posted on Apr 21, 2009

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I have 2007 Opel Astra 1.6 Essentia. It has a miss on low revs. I have replaced The EGR valve as well as crankshaft sensor but to no avail. do you have the answer?


sure lots, you have misfire. when, say EXACTLY.
when does it and when does it not?
guessing is expensive?
misfires in gear or. parked in park or neutral,
or only driving?
why not do the 60,000 mile tune, why not?
spark plugs , that is top of list. not crank shaft sensors.
1: tune it up. spark parts and filters.
2: keyon, CEL glowing , check engine lamp ? good.
3: start car is it glowing now running, yes, that means SCAN it.
4: best practice would be to drive with scan tool connected OBD2.'
and watch to see if you get P030x misfire codes.
The ECU would have told you the CKP crank shaft sensor is bad or good. the ECU does that on all cars, no need to guess and go broke.
if very intermittent it shows up in OBD2 PENDINGS.
the ecu will report 1 in 10 ckp pulses, missing,(sensitive it is this monitor.

Physics.
Misfires:
1: weak compression on 1 or more cylinders.
2: bad spark, (tuneup time and scan it)
3:bad fueling, scan it. see it way off. (can be vacuum leaks)
4: coolant found in the combustion chamber, spark tips look UGLY. nasty . and repeats. with new plug. not looking is FAIL time.
5: EGR closed. at idle, so if misfire is at idle? , bam.
running the EGR is open, so its not egr, if running ,moving are you?

the above order saves time, and cash.
fuel can burn right with bad compression or spark so fueling is dead last.






Jun 17, 2014 | 2007 Opel Astra 1.6

1 Answer

Ignition missing at low revs under load and speedometer dropping out


have the OBD codes read at a garage that will give you a starting point as could be one of many things

Apr 03, 2014 | 2000 Daewoo Lanos

1 Answer

My '98 900 SS ie misses and backfires at low revs, around 60 k/p/h and slower. Thanks.


The engine misses the firing as there is a faulty electrical issue or a fuel mismatch on the settings.
Now if this happens ONLY on the lower RPM,But there is very good performance at higher RPM then it is possible that the timing is set or is offset. It will best to have the engine tuned with the correct timing using the right equipment. Check the engine firing at low RPM Make sure there is no gasket leak on the manifold/exhaust that would change the firing.

Jan 19, 2011 | 1998 Ducati 900 SS

1 Answer

Missing under load, When accerating or climbing a hill my LOW milage 4runner is starting to miss. what could it be? Spark plugs or ?


Start with the simple things first. When was the last time you had a complete tune up? "Missing" could indicate bad spark plugs, bad spark plug wires, or bad cylinders. Change the plugs first, then go from there.

Nov 06, 2010 | 1998 Toyota 4Runner

1 Answer

Hyundai Accent intermittent jerking


Revs.
As for the issue of the idle revs, that's perfectly normal. When it's cold outside, every car is supposed to have a higher rev in order to warm up the engine quickly. In more advanced cars, the computer wont even allow the engine to shift into overdrive when it's cold outside in order to avoid extreme engine stress and damage. When it's warm outside, the engine doesn't need to idle high because the engine is already at a good operating temperature. Not much will be needed to get it to the right temperature.
Intermittent Jerking

There is a long list of things that could cause intermittent jerking. I'm going to name all of them for you, but your best best would be to go to a mechanic and have them do an inspection.
Clogged PCV Valve (Possibly if you don't get your oil changes on time, sign of a tune up)
Bad DIstributor Cap (not likely at 140,000 miles)
Clogged fuel filter (Very likely, usually done with tune up)
Bad Fuel Pump (Not so likely)
Defective ECM (also not likely)
Vacuum hoses/leak (not likely but possible)
MAS (Mass Airflow Sensor--not likely but possible)
Fuel INjectors (if so, sign of a needed tune up)
Faulty Spark Plug Wires (not likely if tune up is recent)
Faulty O2 Sensors (possibly)

Clogged Catalytic Converter (Possible)
~Hope this helps

Jul 29, 2009 | Hyundai Motor 2004 Accent

1 Answer

I have a 98 buick park ave with the 3800 i am have a problem with bad idal and it jurks hard like it is missing at highway speeds. the voltage on the dash metter shows very low and under the hood the...


Please check these components:
PCV valve
EGR valve

Many times these can affect a motor in the way you describe and these do not typically report errors to the computer.

Jul 10, 2009 | 1998 Buick Park Avenue

1 Answer

98 Expedtion hesitation or miss.


throttle position sensor may be bad or need adjusted .or oxygen sensors could be faulty does it idle ruff till it warms up?or maybe map sensor

Mar 24, 2009 | 1998 Ford Expedition

2 Answers

Escort 1998 1.8 zetec mis firing


Hello, did you try changing your coil pack

Feb 07, 2009 | 1996 Ford Escort 4 Door

3 Answers

Crankshaft position sensor for 2004 nissan sentra.


will the crank sensor cause the vehicle to shut down while running?

Nov 14, 2008 | 2004 Nissan Sentra

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