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Intermittent check engine

 
Old 03-24-2019, 01:23 PM
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tom__w
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Default Intermittent check engine

I just got the 2004 4S Cab with 71K miles 3 days ago. Working on some 'cosmetic' type stuff (leaks, brakes, etc) when I noticed today that on deceleration (after pushing it hard) the yellow triangle will flash. It goes away after 5-15 seconds.

I need to plug in my reader but in the meantime, is this indicative of anything in particular?

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Old 03-24-2019, 01:49 PM
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Ahsai
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Yellow triangle sounds like abs/psm. What has been done to the brakes and tires?
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Old 03-24-2019, 02:07 PM
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Originally Posted by Ahsai View Post
Yellow triangle sounds like abs/psm. What has been done to the brakes and tires?
I've only had it 3 days. Nothing by me and little to no service records.
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Old 03-24-2019, 07:01 PM
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Originally Posted by tom__w View Post
I've only had it 3 days. Nothing by me and little to no service records.
Go to the page in your owner's manual that shows the instrument cluster and pictures of the warning lights (maybe around page 68) and tell us what warning light you saw.
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Old 03-24-2019, 07:07 PM
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Originally Posted by jhbrennan View Post
Go to the page in your owner's manual that shows the instrument cluster and pictures of the warning lights (maybe around page 68) and tell us what warning light you saw.
PSM Information light
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Old 03-24-2019, 08:19 PM
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What size tires are you running?
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Old 03-24-2019, 09:02 PM
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Originally Posted by tom__w View Post
PSM Information light
OK...so it's not a CEL that's good. PSM light can flicker on if the PSM sensors intervene in your handling - here's what's said in the manual:

The light indicates PSM intervention even
when PSM is switched off (brake regulation in
the event of one-sided wheel spin).


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Old 03-24-2019, 09:05 PM
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Originally Posted by jhbrennan View Post
OK...so it's not a CEL that's good. PSM light can flicker on if the PSM sensors intervene in your handling - here's what's said in the manual:

The light indicates PSM intervention even
when PSM is switched off (brake regulation in
the event of one-sided wheel spin).
I was worried it was the CEL. Thank goodness it isn't.

I'll get my tire sizes a bit later tonight.
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Old 03-25-2019, 01:44 PM
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Originally Posted by 808Bill View Post
What size tires are you running?
285 / 35 / ZR19 in the back
235 / 35 / R19 in the front

These are the ones it came with.
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Old 03-26-2019, 11:37 AM
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Originally Posted by tom__w View Post
285 / 35 / ZR19 in the back
235 / 35 / R19 in the front

These are the ones it came with.
Any comments on tire size?
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Old 03-26-2019, 11:42 AM
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Scott at Team Harco
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Originally Posted by tom__w View Post
Any comments on tire size?
Sure. They're big.
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Old 03-26-2019, 11:51 AM
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Originally Posted by Scott at Team Harco View Post
Sure. They're big.
LOL, yes they are. Kind of stunned when I had to remove them to clear the drain.

Are these correct for the car? My PSM keeps intervening.
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Old 03-26-2019, 11:57 AM
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Originally Posted by tom__w View Post
LOL, yes they are. Kind of stunned when I had to remove them to clear the drain.

Are these correct for the car? My PSM keeps intervening.
Good question. The two may be directly related.
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Old 03-26-2019, 12:10 PM
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Go to one of the tire diameter calculators and see how close they r. Since u r a c4 they have to be pretty close, 1-2% i think? Im also pretty sure the psm works off the abs sensors so it reads excess spin and pulses the abs.

Your car probably had 18's origianlly but if the 19's fit and they r close in diameter it wont hurt the car.
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Old 03-26-2019, 12:36 PM
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Originally Posted by Scott at Team Harco View Post
Good question. The two may be directly related.

yup.
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