MB,
Was it you who mentioned (a long time ago) the possibility of coolant being forced out the reservoir overflow could be caused by engine back pressure as a result of a plugged PCV or EGR system?
I apologize if I’m wrong.
No need to apologize. You’ve done nothing to apologize for.
Nope, it wasn’t me. I have stated a number of times that oil can be forced through tired old seals by a plugged PCV. The PCV valve is part of the route via which crankcase pressure is relieved.
A plugged EGR system would result in possible pinging and erratic acceleration. And elevated NOx levels. The EGR system only provides for a bit of inert exhaust gasses to be added to the engine’s air instream to keep the combustion chambers from getting too hot. Elevated temperatures can cause pinging and/or preignition, and causes the nitrogen molecules to bond to the oxygen molecules.
Engine back pressure, which I’d interpret to mean pressure behind the exhaust port (in the exhaust manifold) preventing the pistons from pushing the exhaust gas out, would result in reduced power. If the cylinder can’t evacuate, it can’t properly refill with the volatile gas mix. And there’d be some small power used up pushing theh compressed gas out of what should be a free ride.
Of course I’m not doubting the expertise of everyone on here and I’m outdated but did this individual check out my comment way before this one ? Also I had a slight leak in the overflow hose where it connects to the radiator .At first i didn’t notice it until it got worse.There could have been just a little steam leaking out there when driving.I had to add some antifreeze every day,last winter but I replaced the hose along with the upper radiator hose which was collapsing at times and of course the seal on the cap was alot thinner than the new one.What does the antifreeze look like?Are there any combustion products in it? {A little dirty or oily? }.
30years, your comments about the cooling hoses collapsing inside and causing overheating are excellent and something that we often forget to mention. And a leak in the overflow hose is a definite good tip. Such a leak can cause air to be drawn back into the engine when it cools rather than coolant and cause all sorts of havoc.
In this case, the symptoms include a pretty definite headgaskt clue. A leakdown test, where air is pumped into the cylinders, that results in the air then migrating up and out the radiator hole, is pretty definitive. It can only get there through a path in the headgasket.
But your suggestions and comments are always welcome. It’s only through the exchange of ideas that we all grow. People hwo work on anything for a long time or know a subject very well develop a certain thinking process, and very often a totally different perspective provides an opportunity for everyone to learn.
To be imperfectly clear, I wasn’t knocking a particular brand of car. I named specific models, there is no brand war. I missed naming the year, the new Taurus is a model with a better reputation.
Click and clack test drove a Dodge van and they hoped that people would follow the instructions written on the front of it. They also hoped that they wouldn’t follow the instructions written on the back. Front: Dodge Van, rear: Ram Van. I guess the company thought that ramming would be safer from the rear.
I thought that the pleasedodgevan thing would be a nice reminder for everybody who saw the article. I had a 2005 Ford E-150 cargo van and had a great time driving it.
I can imagine how great it must be to drive a Mustang with that 4.6 engine in it. The van had an air filter that looked like a K&N filter except it had a paper element. I own a GMC Sierra and a Yaris with a toy shift gate. I am not planning to buy a Dodge.
I may write about frying the wiring on the 87 Dodge Omni. I could write about my guesswork wiring on the heater fan motor. It was missing due to extensive body repair. I almost forgot, I traded a Dodge pickup for it. Funny, those were the only Dodges I ever owned. Man, did I type all that.
Don’t be thrown off by a name. Remember the joke about a man saying his name was something long like Gerhard Obersnausevick and the hotel clerk asked how to spell it? The man then said A-l J-o-n-e-s. When the clerk said that that was no way to spell it, the man said that the spelling and the pronunciation are slightly different.
I could write a book on Chevrolet. I guess everybody can tell.
To keep an older model Taurus, have the front end alignment checked and done again every two years. It may save a life and a transmission.