Hi gents, haven’t been around here for a while.

I few days ago I discovered a little hose that goes out of the throttle body was leaking coolant all over the place. I replaced it and a few days later I started getting code p0456 , p0191, P0333 and several others .the car started bucking and having a fuel delivery issue. I figured the fuel pressure regulator went bad from all the hot coolant. Replaced it, no luck. Replaced the red vacuum hose that goes to the pressure regulator, still same problem. I am about to replace the fuel pump, but I am thinking the problem lies with the wiring or connector to the regulator that maybe got damaged from all the hot coolant and another sensor in that area.

if anyone has any ideas I greatly appreciate it .

 

Fuel pressure, evap and knock sensor codes = betting it's wiring just my 2 cents. And you already replaced the fuel pump if my memory serves me didn't you?

 

a few years ago. And I have been running the tank too low for obvious reasons, so I thought that may be the case

 

Spike, based on what you are getting, I would be looking at the wiring near the throttlebody for anything that is damaged. From there, work your way back towards the firewall which is where the purge valve is for the P0456 code. At that point, if you have not found anything, then you are tracing the wire bundle back across the top of the engine towards the ECU. This is about all that I can think of based on what you have said. I am thinking more damaged wiring than fluid inside of a sensor. Main reason for this is that you would have to have fluid inside of 3 things, all failing at the same time, not a likely situation. Getting a bunch of wiring pinched somewhere, that would affect multiple things all at the same time.

 

Thermo, or engine heated fluid damaging the wires? Or weakening them that when moved repairing the hose did damage inside?

 

Dell, most insulation on wiring is good for up to 400F, if not higher. So, having coolant drip on it is not that big of a deal. You get the coolant inside a connector, that can possibly cause some shorting and possibly cause the computer to see funny things. But, that is a rarity as you need a pretty good signal to create hate and discontent like this. You get a wire near the EGR valve tubing or the exhaust headers, now you have enough heat.

 

I was thinking not just fluid dropping on wires but, pooling and being heated on the engine cooking touching wires? Spaghetti? Lol.

 

Dell, yes, adding coolant to water does raise the boiling temp of the water. But, even with this said, the water is still going to boil. So, instead of boiling at 212F, it may boil at 250F. No where near say 400F. The insulation is not going to turn gooey just because it is sitting in water (being cooked like spaghetti). You are more likely to see the insulation being damaged by the metal (that is heating the water), than by the water itself.

 

Thanks for the replies. I went ahead and changed the fuel pump just to rule that out. Second time it took me under an hour to do.


But I do think the problem is with the wiring up front. Seems like moving the connector to the throttle body (I have the later style) makes the car idle different. Could be my imagination.