86.5 7MGE Problems

86.5 7MGE · 09-30-2009, 05:57 PM

OK, so I'm starting to think that I have a BHG. My symptoms include...radiator fluid spraying out constantly from the purge port on the reserve and when I drive sometimes not all the time it will start hesitating while the accelarator is pressed. It seems that I have to fill up the radiator every two days or so because of all of the fluid being purged out. I had Pepboys do a pressure check on my coolant system and they said it was my radiator cap at fault. So, I replaced all of my coolant hoses and vaccum lines to include the radiator cap and thermostat...is there something else that I can try that I'm missing before I assume that it's a BHG??? I still seem to have great power and only powerloss when my radiator gets low on coolant or it starts to hesitate.

At the same time I see traces of black smoke on my rear bumper and I know that white steam/smoke is a sign of a BHG due to coolant mixing in the combustion chambers. Could this be also from worn out piston rings?

Bill UK · 09-30-2009, 08:32 PM

If it’s any consolation I had a 1986.5 from new and managed to clock up 250.000 miles with the original engine, ok a few BHG`s on the way and a puff of black smoke now and again. The radiator should suck up the coolant from the expansion tank when left over night, so there should be no need to top up the radiator unless the expansion tank is so full and overflows and looses coolant. In my experience the temperature gauge only reads high when it just about to run out of coolant or the water pump has packed up (mainly due to the impellors worn out) I would check the water pump and the condition of the radiator.

86.5 7MGE · 09-30-2009, 08:53 PM

Ok Bill thanks for the imput I'll check on that. I have 244,000 miles give or take on it but before then when I purchased it the guy I bought it from said that the engine has been rebuilt, but couldn't find the paperwork on it. But I do see a placard on the engine from where it has been rebuit. The radiator looks worn I'll post pics asap. But not too sure about the water pump. Is there a way to test the water pump to see if it's operational or not?

Bill UK · 09-30-2009, 09:36 PM

I've often wondered about that myself, removing the cap and looking into the rad doesn’t tell you much. I guess you need some method of measuring coolant flow through the system. The reason I mentioned the water pump is I got caught out once; I had the usual over flowing expansion tank bottle, gurgling behind the dash noise and over heating. Did a BHG repair and drove it for about 10 miles down the road, opened the hood to find coolant overflowing from the expansion tank bottle. To cut a long story short, I removed the water pump to find the impellors had disintegrated due to the acidic condition of the coolant from previous BHG over the years. Combustion gases mixed with the coolant will start etching the metal parts such as water pump impellors. As you can imagine I'm a bit paranoid about water pump corrosion now.

86.5 7MGE · 09-30-2009, 09:47 PM

Wow, I actually hear gurgling behind the dash when I start my car after it has set for a while. The overflow tank stays full to the brim and doesn't suck back into the radiator like you stated it's suppose to. It just purges as I drive. Oh yea I forgot to mention that when I went in to change out the thermostat it was placed in backwards. Do you think that would have caused even more chances of water pump failure?

86.5 7MGE · 10-01-2009, 04:47 AM

Here are some pics that I took today of my expansion tank, radiator, and water pump.

Tbredd7 · 10-02-2009, 06:50 AM

Quote:

Originally Posted by 86.5 7MGE

when I drive sometimes not all the time it will start hesitating while the accelarator is pressed

I am experiencing the exact same problem with the 86.5 7mge I just purchased. If you fix the problem please let me know what you did. I am going to start by replacing some vacuum lines.

86.5 7MGE · 10-02-2009, 07:31 AM

Quote:

Originally Posted by Tbredd7

I am experiencing the exact same problem with the 86.5 7mge I just purchased. If you fix the problem please let me know what you did. I am going to start by replacing some vacuum lines.

Good luck to you too, and if you figure it out before I do let me know as well...thanx

86.5 7MGE · 10-03-2009, 11:45 PM

Quote:

Originally Posted by Tbredd7

I am experiencing the exact same problem with the 86.5 7mge I just purchased. If you fix the problem please let me know what you did. I am going to start by replacing some vacuum lines.

Right as it sttarts to hesitate I start to smell a strong odor of gasoline I just recently started running 91 grade was running 89 grade or mid grade. I'm starting to think it may be the timing or bad injectors...maybe even both.

Krem · 10-04-2009, 12:06 AM

eh? upgrading the fuel could cause problems? I thought it was if you downgraded the fuel, you were more susceptible to problems?

09-30-2009, 05:57 PM	#1
86.5 7MGE 3" Exhaust Join Date: May 2009 Location: Denver Posts: 104	86.5 7MGE Problems OK, so I'm starting to think that I have a BHG. My symptoms include...radiator fluid spraying out constantly from the purge port on the reserve and when I drive sometimes not all the time it will start hesitating while the accelarator is pressed. It seems that I have to fill up the radiator every two days or so because of all of the fluid being purged out. I had Pepboys do a pressure check on my coolant system and they said it was my radiator cap at fault. So, I replaced all of my coolant hoses and vaccum lines to include the radiator cap and thermostat...is there something else that I can try that I'm missing before I assume that it's a BHG??? I still seem to have great power and only powerloss when my radiator gets low on coolant or it starts to hesitate. At the same time I see traces of black smoke on my rear bumper and I know that white steam/smoke is a sign of a BHG due to coolant mixing in the combustion chambers. Could this be also from worn out piston rings? __________________ Cold Air Intake MIZU Aluminum Radiator Ralco RZ Underdrive Pulley NGK Wires and Plugs Hi Flow CAT MR Muffler Super Coil Techna Fit Brake lines Clear Corner Turn Signal Lens Projector Head Lights Evo Fog Lights Evo Body Kit Soon ---> 3'' Exhaust Last edited by 86.5 7MGE; 09-30-2009 at 06:01 PM.

09-30-2009, 08:53 PM	#3
86.5 7MGE 3" Exhaust Join Date: May 2009 Location: Denver Posts: 104	Ok Bill thanks for the imput I'll check on that. I have 244,000 miles give or take on it but before then when I purchased it the guy I bought it from said that the engine has been rebuilt, but couldn't find the paperwork on it. But I do see a placard on the engine from where it has been rebuit. The radiator looks worn I'll post pics asap. But not too sure about the water pump. Is there a way to test the water pump to see if it's operational or not? __________________ Cold Air Intake MIZU Aluminum Radiator Ralco RZ Underdrive Pulley NGK Wires and Plugs Hi Flow CAT MR Muffler Super Coil Techna Fit Brake lines Clear Corner Turn Signal Lens Projector Head Lights Evo Fog Lights Evo Body Kit Soon ---> 3'' Exhaust

09-30-2009, 09:47 PM	#5
86.5 7MGE 3" Exhaust Join Date: May 2009 Location: Denver Posts: 104	Wow, I actually hear gurgling behind the dash when I start my car after it has set for a while. The overflow tank stays full to the brim and doesn't suck back into the radiator like you stated it's suppose to. It just purges as I drive. Oh yea I forgot to mention that when I went in to change out the thermostat it was placed in backwards. Do you think that would have caused even more chances of water pump failure? __________________ Cold Air Intake MIZU Aluminum Radiator Ralco RZ Underdrive Pulley NGK Wires and Plugs Hi Flow CAT MR Muffler Super Coil Techna Fit Brake lines Clear Corner Turn Signal Lens Projector Head Lights Evo Fog Lights Evo Body Kit Soon ---> 3'' Exhaust Last edited by 86.5 7MGE; 09-30-2009 at 10:09 PM.

10-01-2009, 04:47 AM	#6
86.5 7MGE 3" Exhaust Join Date: May 2009 Location: Denver Posts: 104	Here are some pics that I took today of my expansion tank, radiator, and water pump. Attached Thumbnails __________________ Cold Air Intake MIZU Aluminum Radiator Ralco RZ Underdrive Pulley NGK Wires and Plugs Hi Flow CAT MR Muffler Super Coil Techna Fit Brake lines Clear Corner Turn Signal Lens Projector Head Lights Evo Fog Lights Evo Body Kit Soon ---> 3'' Exhaust

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09-30-2009, 08:32 PM	#2
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	If it’s any consolation I had a 1986.5 from new and managed to clock up 250.000 miles with the original engine, ok a few BHG`s on the way and a puff of black smoke now and again. The radiator should suck up the coolant from the expansion tank when left over night, so there should be no need to top up the radiator unless the expansion tank is so full and overflows and looses coolant. In my experience the temperature gauge only reads high when it just about to run out of coolant or the water pump has packed up (mainly due to the impellors worn out) I would check the water pump and the condition of the radiator.

09-30-2009, 09:36 PM	#4
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	I've often wondered about that myself, removing the cap and looking into the rad doesn’t tell you much. I guess you need some method of measuring coolant flow through the system. The reason I mentioned the water pump is I got caught out once; I had the usual over flowing expansion tank bottle, gurgling behind the dash noise and over heating. Did a BHG repair and drove it for about 10 miles down the road, opened the hood to find coolant overflowing from the expansion tank bottle. To cut a long story short, I removed the water pump to find the impellors had disintegrated due to the acidic condition of the coolant from previous BHG over the years. Combustion gases mixed with the coolant will start etching the metal parts such as water pump impellors. As you can imagine I'm a bit paranoid about water pump corrosion now.

10-04-2009, 12:06 AM	#10
Krem 3" Exhaust Join Date: Sep 2009 Location: Las Vegas Posts: 167	eh? upgrading the fuel could cause problems? I thought it was if you downgraded the fuel, you were more susceptible to problems?