tft...tft...tft...tft... (1 Viewer)

[dorcom]

tft.......tft......tft.....tft....tft...tft..tft.
That's how my '86 FJ60 with 270k + miles sounds when accelerating on a cold engine. After it warms up the "tft ..."d gradually fades into a bf...bf...bf...bf until it almost fades completely fh.. fh... fh... or even less. It has gradually developed.

I bought the car in December for a mer 1k$ knowing that it will ask me for
T.L.C.! It runs well can do 85 mph on the freeway, slurps gas like there is no tomorrow (City 8-10mpg/ Highway 15-17mpg).

One of the problems I had was frequent stalling and irregular accelerating on a warm engine especially after brief ca. 10 minute stop. The engine still warm I had to pull the choke halfway out so it would accelerate smoothly! To lean...?
(The smog test showed to high NOX with no CO!)
After some tweaking I passed. But acceleration problem stayed.

Later
I checked all the vac hoseing and found one cracked. Replaced it and the problem got worse. When I checked the EGR for function as described all was OK and the engine stalled in idle as prescribed. Hmmm, i thought, similar behaviour like the frequent stalling and irregular accelerating on a warm engine.

So I disconnected as an experiment the EGR vac hose. Bingo! smooth acceleration with very little if at all stalling even after the before mentioned brief ca. 10 minute stop and even more efficient!

However, the tft..tft..tft sound gets progressively worse (louder). When I open the hood I can hear it clearly even in idle on a cold engine. I can smell it too! but I am unable to locate it.

I suspect the manifold gasket?
My big question: Can the manifold be relatively easy removed (some bolts seem to be very difficult to get at) or is there more involved? the shop book I have is not to clear about it.

Anyone can advise?

Thank you in advance!

Rob

 

[yournamehere]

GREAT DISCRIPTION OF THE SOUND.

That does sound like the exhaust/intake manifold gasket.

or EGR pipe leak

Check your timing also. Maybe serious spark knock?

 

[euclid]

Sounds like valves to me, unless there is an airey type sound.

Check for vacume leaks by using a butane or propane torch. Turn it on, don't light it. Run it over vacume lines and listen for a slight increase in the idle. If the idle goes up, there is a vacume leak and the butane is sucking in and burning off.

Check for exaust leaks using a 4" lenght of old garden hose (hose pipe where I'm from). Poke it around down by the exaust manifold and around anywhere else there might be a leak. Put your ear by the other end. You will be able to zone in directly to where the leak is.

 

[Tinker]

Carb cleaner will also cause the engine to speed up & it's easier to tell where the leaks are because you can see it.

 

[daddyo]

Those are classic symptoms of an exhaust leak. You hear that sound and it goes away when it warms up.

Andrew

 

[macneill]

I'm no expert, but it sounds like the exhaust manifold.

Mine did after the header install, then stopped once it was re-torqued.

 

[dorcom]

Those are classic symptoms of an exhaust leak. You hear that sound and it goes away when it warms up.

Andrew

That I figured out a while ago!!

 

[dorcom]

Sounds like valves to me, unless there is an airey type sound.

Check for vacume leaks by using a butane or propane torch. Turn it on, don't light it. Run it over vacume lines and listen for a slight increase in the idle. If the idle goes up, there is a vacume leak and the butane is sucking in and burning off.

Check for exaust leaks using a 4" lenght of old garden hose (hose pipe where I'm from). Poke it around down by the exaust manifold and around anywhere else there might be a leak. Put your ear by the other end. You will be able to zone in directly to where the leak is.

Great idea with the garden (hose pipe) hose! Thanks.