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Unread 03-03-2010   #1 (permalink)
shrek400ex is offline Rookie


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Question 1989 Mustang GT Cobra makes horrible noise on hard acceleration

Hi new to this but im in the process of buying a 1989 mustang gt cobra it has a automatic tranny in it and yesterday when i took it for a test drive it would go fine if you gave it gas like normal but if you hammered down on it it would go like it suppose to but makes a horrible tapping noise but only does it when you smash on the gas besides that it runs and shifts fine. i dont know much about this car yet but want to get it for a summer toy so any help would be great he said a guy told him it could be his flywheel maybe. I guess it start doing it for him one day when he was driving around town and started slammin through the gears cause its got a b&m slap shifter in it so any ideas would be helpfully thanks Dave:worship
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Unread 03-03-2010   #2 (permalink)
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Quote:
Originally Posted by shrek400ex View Post
Hi new to this but im in the process of buying a 1989 mustang gt cobra it has a automatic tranny in it and yesterday when i took it for a test drive it would go fine if you gave it gas like normal but if you hammered down on it it would go like it suppose to but makes a horrible tapping noise but only does it when you smash on the gas besides that it runs and shifts fine. i dont know much about this car yet but want to get it for a summer toy so any help would be great he said a guy told him it could be his flywheel maybe. I guess it start doing it for him one day when he was driving around town and started slammin through the gears cause its got a b&m slap shifter in it so any ideas would be helpfully thanks Dave
Does the tapping noise come from the engine? If so it sounds like a lifter. That's not good. You'll be looking at an engine rebuild. If you get the car for cheap then it might be worth it if you rebuild the engine. Btw's a mustang gt cobra????? It's a GT or a Cobra.
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Unread 03-03-2010   #3 (permalink)
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highly doubt its a cobra if its auto. The car has been beat on im sure. Take it to a reliable shop around town and ask for a look over. That little money upfront can save you alot in the long haul. The tapping noise you hear could be coming from the valvetrain not getting enough oil at high rpms.
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Unread 03-03-2010   #4 (permalink)
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Welcome to the site. If it's an 89, its not a cobra. Cobra's were only available in 1993 on the fuel injected fox bodies. The sound under hard acceleration sounds more like detonation to me. Get it checked out and don't get fooled if the seller slapped some cobra emblems on it and is trying to say it's a cobra. In 89, they did come out with 25 anniversary emblems but I think those were on the interior.
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Unread 03-03-2010   #5 (permalink)
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Its def not a cobra if its an 89. I know that when i ran my 89 gt vin throught carfax it has it listed as a "Ford Mustang GT Cobra". But we all know its not lol. Also sounds like detonation. If it was a lifter youd hear it at idle a bit also. Detontion would most likely only be heard at the higher rpms.
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Unread 03-03-2010   #6 (permalink)
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With out sitting in the car it sounds like timing is too advanced, or an exhaust leak, or the torque converter is balloned(unlikely).

You can try just knocking the timing down a little and see if that fixes the problem.
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Unread 03-03-2010   #7 (permalink)
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If the car isnt what the guy says it is I would consider looking elsewhere unless its dirtcheap lol. what else could he be fibbing about? Plus with a slap shift insalled its prolly a wanna be drag car thats been ragged out. Does it make the noise in nuetral or park? if so its amotor problem that you need to know everything about before you consider what you are willing to spend on it, or consider buying it at all. Noises are somtimes a very expensive advenure.
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Unread 03-03-2010   #8 (permalink)
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OK thanks for all the quick replys I double checked with the owner and it says 1989 mustang cobra on the title and i had him go start it and rev it up in park and in high rpms it makes the noise also. So from what i gather from you guys its the lifters correct ? If so do you guys think its worth the money to get the body is solid inside is decent shape and its only got 49k orginal miles and he wants $2500
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Unread 03-03-2010   #9 (permalink)
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pretty sure the canadian mustangs were GT/Cobra's

Quote:
Originally Posted by MustangGT.org
1984 – 1992 Mustang Cobra GT’s
Quote:
Originally Posted by MustangGT.org
While all 1982-1993 Canadian-export Mustangs did have slight differences from their U.S. counterparts, the biggest source of confusion for most people always seems to be regarding the 1984-1992 Canadian Mustang GT’s due to the addition of the word “Cobra” to their name by Ford of Canada.
First of all, let’s get the proper terminology straight, because this is the key to generating the least amount of confusion about these cars… all 1984–1992 Mustang GT’s sold in Canada were marketed as “Mustang Cobra GT’s” by Ford. Hopefully by using ”Canadian Mustang Cobra GT” or “Cobra GT” for short, people will not be confused by other “Cobras” produced by Ford including the 1979-1981 Mustangs equipped with the Cobra package and the 1993-up SVT Cobras (more on these models later in the article).
The term “Cobra GT” is found in 1984-1992 Canadian Ford sales brochures and other Ford-produced literature in place of the term “GT” used in U.S. Mustang literature. In addition, the words “Mustang Cobra GT” were also used on the window stickers of all 1984-1992 GT’s sold in Canada. The term “Cobra GT” was a direct replacement for the word “GT” in Ford of Canada Mustang literature during this time period. Interestingly, no other Mustang models such as the L, GL, GLX, LX, LX 5.0L Sport or Turbo GT received a different name in Canada. Canadians report that this “Mustang Cobra GT” terminology is also used when registering and insuring these cars in Canada. Canadian owners have also told us that even though Ford did not call the 1982-1983 and 1993 Mustang GT's "Cobra GT's", this terminology mistakenly shows up for 1982-1983 and 1993 Mustang GT's in insurance databases.
The addition of the “Cobra” name leads many people to believe that these cars have additional performance equipment or special features over a regular U.S. GT, but that is NOT the case. The bottom line is 1984-1992 Canadian Cobra GT’s are simply the Canadian version of the U.S.-sold 1984–1992 Mustang GT. The difference is in NAME only; there are NO fundamental differences between the Canadian and U.S. GT models. Performance-wise, the 1984-1992 Canadian Cobra GT’s were absolutely no different than their American GT counterparts (including horsepower figures, available engines, transmissions and suspensions). This fact has been verified through a number of sources including the comparison of Canadian vs. U.S. Ford sales brochures and individual car’s build sheets and window stickers.
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Unread 03-03-2010   #10 (permalink)
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The rocker can be adjusted make sure it doesnt smoke badly. A lifter is a little more work but not too bad if you are mech inclined. May want to pull the valve cover and see if its just a loose rocker arm.
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Unread 03-03-2010   #11 (permalink)
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sometimes an exhaust leak can make a ticking/tapping noise too..
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Unread 03-03-2010   #12 (permalink)
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It only makes noise when you rev it up. Sitting there idiling it makes no noise and it doesn't smoke
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Unread 03-04-2010   #13 (permalink)
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Thanks everyone for your help i didnt get the car the guy went to take it to a shop to get it checked out for me and the motor locked up on his way there
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Unread 03-04-2010   #14 (permalink)
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WOW what a coincidence lol... good thing you didnt buy it
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