MY94 WRX coughing, spluttering, flat spot....
29 May 2009, 08:01 AM
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MY94 WRX coughing, spluttering, flat spot....
Hi all,
Had a problem a few weeks back where the car was hesitating under load. Well that is fixed now due to a bad coil pack. The car has been running great for the past 2 weeks........ THEN.......... It has developed a flat spot, coughing spluttering issue. Sometimes it does it first thing in the morning when I take off, other mornings it will be fine. Some days it will run fine, other days it will cough and fart all over the place. It is mainly on light accelaration, but has done it under load also. Its like, you put your foot down and it splutters and sounds like it is going to stall and jerks back n forth.....????
The fuel filter is new, just had an oil change, new coil pack on one cylinder, the plugs are in good condition and gapped right, I have cleaned the Idle air control valve, the PCV valve, the AFM is clean and Im running out of ideas and getting a little frustrated as this is my first scooby and have only had it for a month and a bit and all Ive done is work on it!!!
Any help or suggestions much appreciated. Thanks all.
Had a problem a few weeks back where the car was hesitating under load. Well that is fixed now due to a bad coil pack. The car has been running great for the past 2 weeks........ THEN.......... It has developed a flat spot, coughing spluttering issue. Sometimes it does it first thing in the morning when I take off, other mornings it will be fine. Some days it will run fine, other days it will cough and fart all over the place. It is mainly on light accelaration, but has done it under load also. Its like, you put your foot down and it splutters and sounds like it is going to stall and jerks back n forth.....????
The fuel filter is new, just had an oil change, new coil pack on one cylinder, the plugs are in good condition and gapped right, I have cleaned the Idle air control valve, the PCV valve, the AFM is clean and Im running out of ideas and getting a little frustrated as this is my first scooby and have only had it for a month and a bit and all Ive done is work on it!!!
Any help or suggestions much appreciated. Thanks all.
29 May 2009, 09:12 AM
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are you running it on a high RON fuel? probably isnt the cause but 95 RON in some cases causes the engines to run really rough if they have previously been run on 99, especially imports as they are mapped to 100 RON as standard
29 May 2009, 09:20 AM
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Does it have any mod's?
It could be another coil pack. It's always a good idea to change all 4 at the same time. Try brand new plugs gapped correctly I think 0.7 is the gap PRF7B or 6B rings a bell.
Earlier Imports are not mapped for 100ron fuel...
It could be another coil pack. It's always a good idea to change all 4 at the same time. Try brand new plugs gapped correctly I think 0.7 is the gap PRF7B or 6B rings a bell.
Earlier Imports are not mapped for 100ron fuel...
29 May 2009, 09:39 AM
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MY94 WRX coughing, spluttering, flat spot....
Yeh Im using 98 RON. Im thinkin I mite have to do the other coil packs and replace the plugs. Im going to test for any fault codes tomorrow and see what I get.......
Thanks guys
Thanks guys
29 May 2009, 09:40 AM
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as above probably coil packs if one was already shot then the chances are that the rest are on there way out.
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29 May 2009, 04:33 PM
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https://www.scoobynet.com/general-te...tics-test.html
Lets tie these threads together.
Lets tie these threads together.
Your right, they were a bugger to find...!!!! But I found them. I just did the test and got codes....
23 : MAF sensor
45 : MAP sensor.
I did a couple of tests on the MAF by disconnecting while the car was running and it stalled, therefore I assumed it was working ok. Would disconnecting it have given the fault code?
The MAP sensor, I have a fuel cut defender plumbed into the vacuum line. Would that make the MAP sensor give an error code and play up??
Confused!!
23 : MAF sensor
45 : MAP sensor.
I did a couple of tests on the MAF by disconnecting while the car was running and it stalled, therefore I assumed it was working ok. Would disconnecting it have given the fault code?
The MAP sensor, I have a fuel cut defender plumbed into the vacuum line. Would that make the MAP sensor give an error code and play up??
Confused!!
Last edited by dan83590; 29 May 2009 at 04:39 PM.
30 May 2009, 09:43 AM
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MY94 WRX Coughing, Spluttering hesitation.
So I did a fault test using the black connectors under dash and got fault code 23: MAF sensor.
Today I removed the MAF sensor and noticed that all 4 bolts that hold the maf to the air box were loose..... Anyway, cleaned the MAF, let dry and reinstalled and tightened the bolts up properly and........
Running beautifully now. No more hesitation or coughing.
Do you think the loose bolts may have contributed to poor running also?
Today I removed the MAF sensor and noticed that all 4 bolts that hold the maf to the air box were loose..... Anyway, cleaned the MAF, let dry and reinstalled and tightened the bolts up properly and........
Running beautifully now. No more hesitation or coughing.Do you think the loose bolts may have contributed to poor running also?
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