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84 Mercury Cougar not firing but sparks
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sargerock
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Sep 11, 2009, 4:59 AM
Post #1 of 24
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84 Mercury Cougar not firing but sparks
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1984 Mercury Cougar 5.0 8 cyl 170,000 miles carb.
was running fine till other day when just wouldnt start. turns over ok, good spark from coil and to plugs, new plug wires. gas flows to carberator when key is on,when i remove fitting before carb ..... but when accel is pumped, i see no gas coming from out of jets coming from duel carb. I can pour gas or starting fluid and still NO fire or any sort of kick over!!!!!!
thanks
Greg
ps also replaced ign coil and pressure regulator
(This post was edited by sargerock on Sep 11, 2009, 5:02 AM)
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Tom Greenleaf
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Sep 11, 2009, 6:23 AM
Post #2 of 24
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Re: 84 Mercury Cougar not firing but sparks
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Check compression to see it timing chain jumped,
T
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sargerock
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Sep 11, 2009, 6:37 AM
Post #3 of 24
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Re: 84 Mercury Cougar not firing but sparks
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its a belt not chain :)
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Hammer Time
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Sep 11, 2009, 7:08 AM
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Re: 84 Mercury Cougar not firing but sparks
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OK, let me clear you up on a few things
First, if you have a 5.0, then you don't even have a carb, it's fuel injected and it has a timing chain, not a belt. It sounds like you may need someone else to diagnose this for you. I'll give you the procedure.
All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.
Every engine requires spark, fuel and compression to run. That's what we have to look for.
These are the basics that need to be tested and will give us the info required to isolate a cause.
1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.
2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.
3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.
4) If all of these things check good, then you would need to do a complete compression test.
Once you have determined which of these functions has dropped out,
you will know which system is having the problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Sep 11, 2009, 7:12 AM
Post #5 of 24
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Re: 84 Mercury Cougar not firing but sparks
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It's a chain and the OE had a nylon cam gear that would break up with age even with well cared for cars.
The 5.0 (302 cid) never used a belt TMK - part looks likes this and is a PITA to get water pump off to get to it if this is the current issue at all. If not it will be if an original chain set!
T
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Tom Greenleaf
Ultimate Carjunky
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Sep 11, 2009, 7:22 AM
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Re: 84 Mercury Cougar not firing but sparks
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Hammer - are we cossing swords thru the air waves again? Took me longer to find the pic then YOU to write a reply!
Tis not unusual for the OE nylon gear to be erratic like this but would near certainly show uniform low compression and could snap out of that during a test causing all kinds of hair loss to diagnose. I know these gears if OE they don't usually do that much time!
T
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Hammer Time
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Sep 11, 2009, 7:42 AM
Post #7 of 24
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Re: 84 Mercury Cougar not firing but sparks
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I totally agree but at this point all we know about the problem is that we have spark. That leaves a lot of possibilities still.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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sargerock
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Sep 11, 2009, 7:56 AM
Post #8 of 24
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Re: 84 Mercury Cougar not firing but sparks
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dude, its a carb.....2 barrel...and theres no doubt, a motocraft
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Hammer Time
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Sep 11, 2009, 8:00 AM
Post #9 of 24
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Re: 84 Mercury Cougar not firing but sparks
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What's the 8th digit of the VIN#?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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sargerock
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Sep 11, 2009, 8:03 AM
Post #10 of 24
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Re: 84 Mercury Cougar not firing but sparks
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fuel is spewing up to carb when i turn on ignition, , pump accel cable, no fuel from jets.and i have ign key on...........i installed new coil, sparks are all good at all plugs, , and i replace all 3 belts including seep when car turns over, spark plug testor flashes good, but no fire with starter fluid. and again, it was a serp belt i rpl.
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sargerock
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Sep 11, 2009, 8:06 AM
Post #11 of 24
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Re: 84 Mercury Cougar not firing but sparks
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the letter f
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sargerock
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Sep 11, 2009, 8:09 AM
Post #12 of 24
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Re: 84 Mercury Cougar not firing but sparks
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1mebp92f.....
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Hammer Time
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Sep 11, 2009, 8:12 AM
Post #13 of 24
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Re: 84 Mercury Cougar not firing but sparks
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If the VIN code is "F". then the car came with a fuel injected engine. You talk about fuel with the key on indicating an electric fuel pump. That is only used with fuel injection. If someone slapped a carb on that engine, it's not going to work.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
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Sep 11, 2009, 8:13 AM
Post #14 of 24
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Re: 84 Mercury Cougar not firing but sparks
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Hammer spelled this out about as well as you'd see anywhere on the web! Spark, fuel, compression and you would have some reaction. I maintain that if the timing (valve) is so far off it won't react - got the T-shirt! Carb, injected or not almost doesn't makes a rat's a$$ right now!
T
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Hammer Time
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Sep 11, 2009, 8:21 AM
Post #15 of 24
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Re: 84 Mercury Cougar not firing but sparks
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It will make a hell of a difference is someone was foolish enough to stick a carb in front of that electric fuel pump. He says it's pouring fuel out everywhere.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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sargerock
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Sep 11, 2009, 8:21 AM
Post #16 of 24
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Re: 84 Mercury Cougar not firing but sparks
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ok i dont say i dont believe you, but yes it has a fuel pump in back next to fuel filter...it has 2 wires going to it.....and when u turn on ign it spews out...and it has a 2 barr carb..and the cars run since 1984 ....without any modifications...
sorry but i think i know what a carb looks like....like i said..ran fine till i parked at church for 20 min....then it started for like 10 sec....never fired since
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sargerock
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Sep 11, 2009, 8:23 AM
Post #17 of 24
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Re: 84 Mercury Cougar not firing but sparks
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and big words say motocraft on carb
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sargerock
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Sep 11, 2009, 8:24 AM
Post #18 of 24
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Re: 84 Mercury Cougar not firing but sparks
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what controls injector pulse ?
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sargerock
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Sep 11, 2009, 8:26 AM
Post #19 of 24
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Re: 84 Mercury Cougar not firing but sparks
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and putting starting fluid WITH a spark at all plugs still gives nothin
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Hammer Time
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Sep 11, 2009, 9:20 AM
Post #20 of 24
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Re: 84 Mercury Cougar not firing but sparks
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Is this what it looks like?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Anonymous Poster
Sep 12, 2009, 9:29 AM
Post #21 of 24
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Re: 84 Mercury Cougar not firing but sparks
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yes
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sargerock
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Sep 12, 2009, 9:32 AM
Post #22 of 24
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Re: 84 Mercury Cougar not firing but sparks
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yes thats it :)
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Guest
Anonymous Poster
Sep 12, 2009, 10:17 AM
Post #24 of 24
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Re: 84 Mercury Cougar not firing but sparks
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yes i am so wrong, i didnt even think of this being so old a car....woith the butterfly chokes n stuff it just reminded me of a carb...so if then,,,, what next? compression?
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