Random miss
Thread Starter
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Tuned
Joined: Oct 2006
Posts: 411
Likes: 13
From: Great northwest
Random miss
Well, I had a miss and got it resolved. Car ran great for 2 weeks, now it is missing again, and under powered. I am not setting any codes, but I can feel it. More noticeable at lower RPM.
I have just done plugs, and used the autolite platinum and gaped them to the spec on the rad. about .055. This was after solving more persistent issues.
I am at a loss now, and thought I would ask for advice again, before going back to the dealer for another diag.
Thanks
Doug
I have just done plugs, and used the autolite platinum and gaped them to the spec on the rad. about .055. This was after solving more persistent issues.
I am at a loss now, and thought I would ask for advice again, before going back to the dealer for another diag.
Thanks
Doug
Lead Driver
Joined: Dec 2012
Posts: 7,870
Likes: 47
From: Tennessee
Is it your 03 expy ? Could be as simple as a coil boot or cop assy . You could save a lot of money if you buy a code reader and do it yourself . You can buy a reader for as little as $30 . A fair one for $100 . Get some codes , do some research . If nothing else , go to your local chain parts store , have them pull codes . As cheep as code readers are now , everyone should have one ! One that can graph , freeze frame , mode 6 , ect ... $350.00. Good to go !
Thread Starter
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Tuned
Joined: Oct 2006
Posts: 411
Likes: 13
From: Great northwest
I have a inova 3100a. But there are no codes. It does not do live data or anyhing like that.
I have fixed what it was giving me, and it ran good for a couple of weeks. Now it is back....
replaced computer, Plugs, MAF and IAC
So I am at a loss.
I have fixed what it was giving me, and it ran good for a couple of weeks. Now it is back....
replaced computer, Plugs, MAF and IAC
So I am at a loss.
Thread Starter
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Tuned
Joined: Oct 2006
Posts: 411
Likes: 13
From: Great northwest
I did not change the plug boots, Spring also? The boots were very hard to get out.
My code reader is old, so if I buy a new one what do you recommend, so that I get the best options. for a reasonable price.
My code reader is old, so if I buy a new one what do you recommend, so that I get the best options. for a reasonable price.
Lead Driver
Joined: Dec 2012
Posts: 7,870
Likes: 47
From: Tennessee
Change the boots and springs . Ck coil contact , for spring , for a coroded connection . I like the Launch C reader for an inexpensive scan tool . they have a newer one with a color display . I have both .they will give live data and graph live data as well as all 10 modes of obd 2 in the newer one . Otc makes a good one also . I have an older Otc that is great , It will do more than the Launch . But the Otc cost $1200.00 . The launch readers were $150 and $240. I have tried a few brands from the parts stores and was not happy . But my Snap On Modis has me spoiled . Hard to live up to that one .
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Thread Starter
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Tuned
Joined: Oct 2006
Posts: 411
Likes: 13
From: Great northwest
One more thing, I installed motorcraft platinum plugs. And gapped them with a sliding spark plug tool. Read somewhere that this could ruin the plug?
I will get boots and springs. and go from there.
Thanks again!
I will get boots and springs. and go from there.
Thanks again!
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Thread Starter
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Tuned
Joined: Oct 2006
Posts: 411
Likes: 13
From: Great northwest
Was changing the plugs again, and the boots and springs. May have found something, the spade in the COP on some of them is rusted. So I have scraped at it and sprayed them, then will apply silicone grease. Anyone got a better way to clean them short of replacement?
I think this will cause misfires?
I think this will cause misfires?
Thread Starter
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Tuned
Joined: Oct 2006
Posts: 411
Likes: 13
From: Great northwest
Got them all changed, and cleaned. Still missing. But not all of the time.
I disconnected every COP and injector and they all cause a steady miss. The one I have is random. And then I heard sounds from the intake.
This was not getting many responses, so I started another thread about the sound.
Maybe I should have kept it here? Lub dub hiss is what it shounds like. One of the three accompany the miss. I am thinking I have a lifter or two that are starting to have issues. I am going to start it and see if the exhast sounds the same, but it is further away and more muffled.
Going to hange the oil to 10-30 from the 5-20 that is in it now.
I disconnected every COP and injector and they all cause a steady miss. The one I have is random. And then I heard sounds from the intake.
This was not getting many responses, so I started another thread about the sound.
Maybe I should have kept it here? Lub dub hiss is what it shounds like. One of the three accompany the miss. I am thinking I have a lifter or two that are starting to have issues. I am going to start it and see if the exhast sounds the same, but it is further away and more muffled.
Going to hange the oil to 10-30 from the 5-20 that is in it now.
Lead Driver
Joined: Dec 2012
Posts: 7,870
Likes: 47
From: Tennessee
Misfire and popping from intake is usually a lean run condition . Ck fuel pres. Ck for vac. leaks while at it . Ck fuel filter also . Lean pop sounds like what you describe . Low fuel pres. will cause a lean pop sound from intake , misfires , ect . The mod engines do not have many " lifter " issues .
Thread Starter
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Tuned
Joined: Oct 2006
Posts: 411
Likes: 13
From: Great northwest
Ok, I will get a gauge Monday and check the pressure. It is due for the oil change, So I will do that, no issues with 10-30 for one change is there? if so I will take it back and get the 5-20.
Thanks again for your help, and not giving up on me.
Thanks again for your help, and not giving up on me.
Thread Starter
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Tuned
Joined: Oct 2006
Posts: 411
Likes: 13
From: Great northwest
the car has no light, so my code reader is useless. And I can not get into ford for another week. I will call again Monday and see if it is any better. I guess I got to get a better reader too.