I know there are probaly hundreds of these threads around but did not seem to find this symptom which is hard cold starting, could it be coolant in the combustion chamber before start up, after it has cooled down and sat overnight
Early BHG symptoms
- Thread starter nick88
- Start date
nick88;1346161 said:
You have to be more descriptive. Does it sputter for a little while idling at cold startup? Does the idle smooth out a bit and the engine stops sputtering? If so then yes, it's symptoms of a BHG...
Supra90gr;1346166 said:
it starts up fine but cranks over 4 or 5 times before starting the idles at 1.3k then drops to 5-6 hundred and is sputtering
check to see if you have oil in spark plug valley. Does the engine spitout coolant from the reservoir. When the engine first turn over and rev it a little bit do you here waterfall sound? Also check for vacuum leak.
there is oil in the spark plug valley, no waterfall, no coolant spitout from the the reservoir, and did blow off a coolant line on the back of the motor last sunday while just getting into boost at 4 psi
sogi99;1346174 said:
nick88;1346178 said:
you need to clean the spark plug galley and change the valve cover gasket while you are there.
also change your sparklug might've fouled it in the process
nick88;1346191 said:
no hes not sayingyou have a BHG,
hes just trying to help you out on why your having trouble in cold start, cause a struggling cold start doesn't mean Bhg, it could be alot of things just bad leads,plugs,oil in your vallies and soaking your leads.
if your not hearing waterfall then thats a good sign, check your oil and coolent see if theres any types of mixture of color. open your oil cap and see if its a milk shake color if not you dont have a bhg.
I don't mean to complicate this thread but on the order of early symtoms here are some things I,ve been seeing. The engine needs a 3-4 cranks to start when cold then runs smooth after a very slight hesitation from a dead stop.It then runs great and starts quickle when warm; stopper hg, ct-26 57, 3" exhaust added, probes, arp studs top and bottom crank re-aligned.Supra90gr;1346363 said:
EXCEPTION 1:
Liquid Ph coolant tests green not yellow or blue so it's a toss-up?
Will retest in case it's a false positive.
EXCEPTION2
I put a second mech. temp gauge (budget Sunpro) on the rad. side of the thermostat.Just because I had I one and an empty hole spot.
It fluctuates erratically 170-190 deg F with acceleration.The oem gauge (new sender old dash gauge) rises from cold stops, thermostat opens, needle rises then falls and stays steady.
I understand the wax-pellet type thermostat continually changes with coolant temp.
Question is: could this alone make the gauge on the radiator side vary with normal operation.?
It's not losing any coolant but does have decel backfire. I'll try to adjust the dashpot.
I've read that a slight gas leak into the coolant will cause a pressure /temp fluctuation
especially under boost.
I could boost to 10-12 lbs and hit fuel cut.
I have an electronic boost controller I haven't installed yet.
Reading EGT//AFR/ Lambda/ BOOST OR VACUUM on a ZEITRONIX multi display.
I popped a coolant leak in the dead of winter; ran it hot once, a minute or two .I let it sit till warmer weather.
I know the ex. gas in oil is harmful to bearings so I need to resolve this before using this motor further.
The oil is not adulterated visually but I'll send it to Blackstone for analysis.
Last compression results warm. 1-6 respectively were 155,155,150,145,150,155.
Any thoughts.
doesnt help. still 3-4 cranks to start. took it for a ride today got the water fall sound then got it in and parked it and found the milkshake in the spark plug valley up to the spark plugs.enjoyer;1346841 said:
started to tear it apart to get the head off
I had some BHG simptoms. Bad start. Waterfall. Bad start can be erased using my earlyer mentioned stile. Waterfall sound is gone. The only thing thats left is loss of coolant. Strange thing is that she "eats" coolant less and less. At first she used a lot of it. Now the usage is droping steadily.
enjoyer;1347423 said:
if your losing coolent have you checked if you leaking externally? because i had the same problem and it was the thermo neck and water pump gasket.:3d_frown:
Nope, no visible leaks. It's possible that i'ts leaking somewhere under presure, but i can't find any leftovers from coolant. Another thing. When i shut the engine and pop the hood, hissing and boiling sounds are coming from t-stat.arizzle;1347671 said: