check your coolant reservoir cap - TCCoA Forums
 
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post #1 of 10 (permalink) Old 03-15-2011, 12:21 AM Thread Starter
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check your coolant reservoir cap

The story Is as I perceive it. If I am mistaken grill me across the coals so I shall learn the error of my ways.

I have had my 96 for about a year, chasing small gremlins around the car. One oddity is the car never seemed to get up to temperature. The temp gauge would bump up but it would barely pass the blue indicator. Heater would seem to take forever to get nowhere, ect. As for engine performance, at freezing temperatures the car ran like a top. but during thaw, it didn't seem to run right. Nothing obvious other than a random stall, but nothing that would alert anyone. Bucking or knocking, ect. Which brings me to the heart of the story. I had a small issue with a fitting that attaches the heater hose to the manifold. While fixing and doing a coolant flush I noticed my coolant tank cap was broken. Replaced the cap and the temp went up to a normal operating range. car feels peppier in throttle and doesn't feel like it wants to rebel when I do some spirited driving. Previously during spirited driving the car would stall when I came to a stop and would restart after sitting for 5-10 minutes. But if I drove like a geezer it would run fine.

I assume that the cold running engine was conflicting to what the computer was expecting to see, maybe running rich to compensate. Add aggressive driving that may have pushed the parameters beyond acceptable points.

Any other theories?

BTW I am starting to like this car again.
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post #2 of 10 (permalink) Old 03-15-2011, 06:45 AM
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I have a stroker engine in my old Camaro that is finicky with water temps. It runs a LOT better with a 190 degree thermostat than with a 180 degree one. If the water temp stays around 195-200 degrees the car runs it's best.

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post #3 of 10 (permalink) Old 04-07-2011, 03:44 AM
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Funny I was noticing today my car never really gets up to even the N on normal on the temp gage. I might check that cap out and see if it gets to a more normal temp.
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post #4 of 10 (permalink) Old 04-07-2011, 10:05 AM
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Intake gasket leaks will do the same thing; several people here have replaced them in the last year or so.

The indicator I had was water in the drivers' rear plug wells.

Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
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post #5 of 10 (permalink) Old 04-07-2011, 12:07 PM
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Another thing, if the gauge is reading low (but you do have heat and it runs fine), is to check the 1 wire temperature sensor ( sender? Not sure which one it is in parlance ... )

Seems like the one-wire version had a manufacturing flaw that causes low gauge readings.

RwP
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post #6 of 10 (permalink) Old 04-07-2011, 02:07 PM
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the standard ford radiator caps that click so you don't overtighten them are not that good at holding pressure. better to get a regular turn till tight cap.

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post #7 of 10 (permalink) Old 04-07-2011, 02:31 PM
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Quote:
Originally Posted by 91CougarLS View Post
the standard ford radiator caps that click so you don't overtighten them are not that good at holding pressure. better to get a regular turn till tight cap.
do those work on these cars? The OEM cap and the one I believe you are reffering to, are quite different.

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post #8 of 10 (permalink) Old 04-07-2011, 03:18 PM
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It's the same round plastic cap; just the ford ones click when they reach maximum amount like some oil caps, so you can't over tighten them. It is good but not so good also. They have regular ones that just tighten until you stop turning which seal alot better. I used to see the OEM ones leaking and/or not holding the right pressure even brand new a lot unless they fixed them by now lol.

1997 Ford Thunderbird LX 4.6L (WT): Removed Air Silencer. PBR Brake Upgrade. J-MOD. Silverstar Headlights. Vogtland Springs 1.6". Front Sport Shocks/ Back KYB's. PI Cams. Xcal2 by Lonnie.
1991 Mercury Cougar LS 3.8L: SOLD
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post #9 of 10 (permalink) Old 04-07-2011, 03:59 PM
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The AFDB is on a lil tight.
 
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Yeah I have the turn til tight style works great LOL, I know the child proofed caps can break.

Spinning pies like wheels.

DD driving my 20 year old project

Now with new ball joints...again
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post #10 of 10 (permalink) Old 04-07-2011, 04:08 PM
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Quote:
Originally Posted by 91CougarLS View Post
It's the same round plastic cap; just the ford ones click when they reach maximum amount like some oil caps, so you can't over tighten them. It is good but not so good also. They have regular ones that just tighten until you stop turning which seal alot better. I used to see the OEM ones leaking and/or not holding the right pressure even brand new a lot unless they fixed them by now lol.
gotcha.

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