Thread: Noises

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Okay I've been having lots of problems with my ford '89 F-250 with 460 EFI I just rolled 164,000 I have loss of compresion i found a spot on my headers where its leaking out the gasket, then when im driving behind the cab I can hear a blowing out noise and i dont know where its coming from and i have like no pick up i have to slowly build RPM's to shift and i really dont like it If anyone could help please I really miss my beast i just put new plugs, wires, and cap on it.

Sounds like your catalytic converter could be plugged up.

New plug wires won't do a thing for restoring low compression. Could either be a problem of worn out rings, valve seals, or a combination of both. A plugged catalytic converter will have an adverse effect on performance and should be checked. The real problem is with the internals of the engine if the compression is low on one or more cylinders.....

a wet and dry compression check will tell you the condition of the motor. drop the conv. down and drive the truck will tell you if its stopped up.

Yeah, what Mike said. (don't ya just love those "test pipes"?)

Originally Posted by Dave Severson

Yeah, what Mike said. (don't ya just love those "test pipes"?)

they out law those 20 yrs ago around here.

ps- need to check fuel pressure and filter also.

I wasnt saying i replace those parts to restore it the truck needed it anyway but how do i check my fuel pressure i just replaced my fuel filter to so maybe i didnt do something right if i take the cat. out and put a strait pipe through will the help any.

Thanks guys i didnt think i would get this much help this fast.

Originally Posted by wood69ward

I wasnt saying i replace those parts to restore it the truck needed it anyway but how do i check my fuel pressure i just replaced my fuel filter to so maybe i didnt do something right if i take the cat. out and put a strait pipe through will the help any.

Thanks guys i didnt think i would get this much help this fast.

test pipe won't help unless the conv. is stopped up. just take the conv. loose and drive the truck. if the conv. is stopped up you will see a big increase in power. if not put it back on. you don't have to put a test pipe in to check it. you'll need a fuel pressure gauge to check the fuel pressure. i'd check the conv. first.

You can just unbolt the converter ,the 4 bolts on the front,if its a stock one still, it will be REAL loud

Originally Posted by wood69ward

Okay I've been having lots of problems with my ford '89 F-250 with 460 EFI I just rolled 164,000 I have loss of compresion i found a spot on my headers where its leaking out the gasket, then when im driving behind the cab I can hear a blowing out noise and i dont know where its coming from and i have like no pick up i have to slowly build RPM's to shift and i really dont like it If anyone could help please I really miss my beast i just put new plugs, wires, and cap on it.

1) Replace your leaking exhaust manifold gaskets.
2) Do a comrpesison test.
3) If comrpesison readings are low on any cylinders, perform a leakdown test on those cylinders.
4) Get back to us.

Paul

Okay so im ordering headman headers soon. i opened up my truck by puttin 40 series mufflers on and its running alot better right now im waiting for the headers to come so i can get rid of my cat. cause i do believe its clogged up also about 2 weeks ago my truck started to backfire while im driving, is that because of the cat. because this started before i put the flowmasters on. Also what would cause it to do this.

I'm still in highschool 12 grade and so i dont make that much cash i just quit my job for doing drywall and now i do deliveries for a pizza shop i make alot more now and its a steady flow of cash I make about 300 a weak without tips so if you guys know and cheap mods to make me run better let me know thanks

just so you know here is what i have so far on my truck.
K&N
Accel u-grove plugs, wires, and cap
flowmaster dual 3" 40 series
3" sunpro tac
each fill up i put in either STP octane bost or EFI Cleaner


Soon to get are Headman Headers and 3" cowhood also if anyone knows where i could get a Ford Lightning '92 for cheap thanks

stopped up conv. shouldn't make it pop back. where is it pooping back at. the tail pipe or air intake?

Well, yeah, a plugged up exhaust will make it pop back. The hot exhaust is still in the cylinder when the intake valve opens, and boom!
Not necessarily the converter, some Fords use a two-ply exhaust pipe and the inner ply can fold over inside the outer one. That'll drive you crazy trying to find it! I used an infrared thermometer to find the hot spot. If you don't have one just look to see if the pipe is discolouring somewhere along its length with no apparent reason. It'll be cooler from the restriction onward.
On my old Marquis the cut-off pipe was three-ply in one half of the circle, and one-ply on the other, looked like it was made that way! Downstream a foot, it was normal. No flow whatever! All the gases were going through the intake heat riser port, and out the other pipe.

well im replace all the pipeing anyway so do you think that'll make it stop plus im take the big A$$ conv. off.