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EF XR6 - Running on 5 cylinders? Help! 

 

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 Post subject: EF XR6 - Running on 5 cylinders? Help!
Posted: Mon Feb 25, 2008 10:28 pm 
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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

My EF XR6 wagon is running like it has dropped a cylinder - rough idle and running, lack of power. Engine shakes hard on acceleration. Originally did it for about 5 seconds after a cold start, then went away. Now does it all the time, but seems to get noticeably better once up to normal operating temp.

So far:
- have checked plugs: all good colour, gap & condition, no fouling
- replaced coilpack and ignition leads
- swapped idle speed control solenoid
- tested MAP sensor
Nothing has made any difference. Injectors cleaned (out of car) 20k ago. Oxygen sensor replaced 30k ago.

Has anyone had this prob before? Or recommend what to check next? Thanks very much for your help.

 

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95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported EF head, SS Inductions, Territory intake, MLS gasket, milled, Franklin RH24B cam, Coby headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

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Posted: Mon Feb 25, 2008 10:55 pm 
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Did you do a compression test before you replaced all thoes parts. ?

Peform a compression test. Note down all the values.

Then peform the test again after you put 200ML of oil in each cylinder before you test it. If the compression increases its your rings. If no change its the valves.

Also. Start engine. Disconnect each fuel injector untill you find the one that does not affect the bad idle. When you find that cylinder put a 5watt globe across the Injector plug and look for a pulse of light. It will flash frequently. If thats ok reconnect the fuel injector and use a old spark plug on the cylinders lead and look for a spark.

You would most likley have a bad crank angle pickup if there is no spark on just that single cylinder.
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Posted: Tue Feb 26, 2008 12:03 am 
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make sure you're not losing any coolant as this could indicate a head problem
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Posted: Tue Feb 26, 2008 10:03 am 
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just a stab in the dark but sounds like you have blown the head gasket. pretty much exactly the same description as when the head went on the EB.

 

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Posted: Tue Feb 26, 2008 10:43 am 
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mine did this when it snapped a timing chain guide.... sudden loss of power and responsiveness as well it started running crap.

just an option for you to check

 

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Posted: Tue Feb 26, 2008 3:47 pm 
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More Grunt wrote:
just a stab in the dark but sounds like you have blown the head gasket. pretty much exactly the same description as when the head went on the EB.


What he said, happend to my brother EBII and sounds like the same thing.

 

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EL Futura: CVE head, Wolf V500, ICE Ignition and Coil, 36lb injectors, Walbro 255lb, Paci comps, 3" exhaust, T5, Harrop Truetrac with 3.9s. Now with 198.9rwkw, (~185rwkw and 13.80 @99.1mph) with more power to come

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Posted: Wed Feb 27, 2008 5:55 pm 
Getting Side Ways
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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

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Thanks, garsiph. I followed your advice and found it. I disconnected the injectors one at a time and found that Cylinder 1 was the problem. Swapped the injector for a spare I have on hand, and the problem didn't go away. Checked the injector wire and was getting voltage to the injector. Swapped two spark plugs around, and the problem moved with the plug.

All that work, and it was just one spark plug breaking down. Doh! It was still giving a spark when checked, so I didn't suspect the plugs. Just not enough spark to fire the mix.

Have put in a spare plug I had sitting around, so she's mobile again. Putting a set of NGK ZGR6Bs in tomorrow. Time to retire the Autolites (985s) anyway. Something like 50,000kms on 'em.

Thanks a bunch for the help guys (and gals). All's well that ends well.

 

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95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported EF head, SS Inductions, Territory intake, MLS gasket, milled, Franklin RH24B cam, Coby headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

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Posted: Wed Feb 27, 2008 6:38 pm 
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efxr6wagon wrote:
Thanks, garsiph. I followed your advice and found it. I disconnected the injectors one at a time and found that Cylinder 1 was the problem. Swapped the injector for a spare I have on hand, and the problem didn't go away. Checked the injector wire and was getting voltage to the injector. Swapped two spark plugs around, and the problem moved with the plug.

All that work, and it was just one spark plug breaking down. Doh! It was still giving a spark when checked, so I didn't suspect the plugs. Just not enough spark to fire the mix.

Have put in a spare plug I had sitting around, so she's mobile again. Putting a set of NGK ZGR6Bs in tomorrow. Time to retire the Autolites (985s) anyway. Something like 50,000kms on 'em.

Thanks a bunch for the help guys (and gals). All's well that ends well.


Mate exactly the same happend to mine...... did the same tests as what u did i had replaced the plugs 3000kms before with genuine ford parts and no 6 plug was f**k. i couldnt belive it.... s**t ford parts

 

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Posted: Wed Feb 27, 2008 7:30 pm 
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i have had problems with crap plugs breaking down before... champion are not so champion at all.

 

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Posted: Wed Feb 27, 2008 8:30 pm 
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Only use NGK spark plugs, thats all we use in our workshop and never have any problems with them.
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Posted: Wed Feb 27, 2008 8:37 pm 
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Im glad it was a lot easier than you thought.

When I find a bad cylinder like that I pull the plug after running it for a little while and check if the plug is wet. If its wet the injector is normally okay. Swapping injectors is to hard hehe.
Then I try the plug, Then a comp test and after that a gas test of the cooling system. But 99% of the time a cracked head gaskit affects more than 1 cylinder.
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