ok so i was driving and suddenly my engine started to sputter out (rps dropping and regaining for a few seconds) then died totally. it wouldnt start, sounds like the motor wants to crank over but just wont fire. almost like a sewing machine sound. everyone i talked to said it really sounds like a timing belt, just curious what every one here thinks.
It could be a lot of things. The belt is easy enough to check. You can pull the front cover and look at it. I would check the usual things first. Do a visual check for leaks, missing parts, and disconnected parts. Then check for spark, fuel, and compression.
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Don't you SAS me boy.
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What do you mean? Real fast spinning but no catching?
First, like TcmaBoy suggested, it's easy enough to check that belt. Most of the time, you can even just pull some of the 10mm bolts out of it and pull it back to look/feel the belt w/o removing all the stuff to completely pull it.
If it's not the belt, I'd check the Cam Position Sensor and Spark. The cam position sensor has a habit of being baked and cooked due to it's location (round thing sticking outta the front part of the head (up top, passenger side, behind the power steering reservoir)). Simple thing is to have a friend take the harness that connects it (it's 4 wires) and jiggle it while you crank. If it catches, I'd suggest a rewire of that harness. It caused nothing but issues in my factory setup, I quickly picked up a good 4 conductor Male/Female plug and rewired it. No more issues.
If it doesn't start that way, I'd check for spark. Pull the #1 plug wire, throw in an old (working) spark plug, ground it to part of the motor, and have a buddy crank. Watch for spark. [Also keep in mind that if the harness for the CPS is not making a connection, there will be no spark] If yes, proceed to checking for fuel (though this should be rare that they're not firing). Since it's rare, I'll letcha post back on the top two ideas first.
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1988 Mk3 Turbo Targa - 17.5psi, 486hp, 494tq.
[img]http://www.**********s.com/supra/rsw_sig_stupidTN.jpg[/img]
Who came up with this 500px wide BS?
What do you mean? Real fast spinning but no catching?
First, like TcmaBoy suggested, it's easy enough to check that belt. Most of the time, you can even just pull some of the 10mm bolts out of it and pull it back to look/feel the belt w/o removing all the stuff to completely pull it.
If it's not the belt, I'd check the Cam Position Sensor and Spark. The cam position sensor has a habit of being baked and cooked due to it's location (round thing sticking outta the front part of the head (up top, passenger side, behind the power steering reservoir)). Simple thing is to have a friend take the harness that connects it (it's 4 wires) and jiggle it while you crank. If it catches, I'd suggest a rewire of that harness. It caused nothing but issues in my factory setup, I quickly picked up a good 4 conductor Male/Female plug and rewired it. No more issues.
If it doesn't start that way, I'd check for spark. Pull the #1 plug wire, throw in an old (working) spark plug, ground it to part of the motor, and have a buddy crank. Watch for spark. [Also keep in mind that if the harness for the CPS is not making a connection, there will be no spark] If yes, proceed to checking for fuel (though this should be rare that they're not firing). Since it's rare, I'll letcha post back on the top two ideas first.
yea like a real fast spinning but no catching would be a good description.
cool ill try the other stuff and check the timing belt and see if i can find the problem, thanks for the info.
well i dug around and sure enough the timing belt is shredded. i didnt take the cover all the way off just enough to see the belt was done for.
now i was reading the service manual and it says to pull the spark plugs to change the belt... but why? i just changed my plugs and it was such a pain to get to plug 3 and 4 i dont want to do it again unless i really really have to and i know why lol
well i dug around and sure enough the timing belt is shredded. i didnt take the cover all the way off just enough to see the belt was done for.
now i was reading the service manual and it says to pull the spark plugs to change the belt... but why? i just changed my plugs and it was such a pain to get to plug 3 and 4 i dont want to do it again unless i really really have to and i know why lol
Um... The spark plugs in the 7M are the easiest to change of any car I've ever owned. I can do a full set of plugs in like, 15 mins.
Pull the 3000 pipe @ The throttle body. Unbolt the coil pack, unplug each plug wire, and lay it aside. Take you're 3/8" spark plug socket, and start going at it. As for the timing belt. You'll have to pull everything off the front to get at it.
The thing you'll need to remember is to bring it all to Top Dead Center before pulling anything. If you don't, it'll be a NIGHTMARE getting your timing right.
I don't know why it says to remove all the spark plugs though. To make sure you're at 0º TDC, you need to pull the #1 plug, and put something LONG down in the cylinder so you can see when the piston is at the top. Turn the crank (w/a 19mm socket) to where the timing pulley lines up with zero on the cover (The cams are also notched and should line up at the same time) (DO THIS WITH THE BELT ON! You need to turn the cams at the same time!). Then make sure that the screw-driver/whatever you used is at the absolute top and that if you turn the crank at all that it goes down. This means you're at 0º TDC. You can then pull the belt and replace it. Make sure you line everything back up when you put it back on.
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1988 Mk3 Turbo Targa - 17.5psi, 486hp, 494tq.
[img]http://www.**********s.com/supra/rsw_sig_stupidTN.jpg[/img]
Who came up with this 500px wide BS?
Um... The spark plugs in the 7M are the easiest to change of any car I've ever owned. I can do a full set of plugs in like, 15 mins.
Pull the 3000 pipe @ The throttle body. Unbolt the coil pack, unplug each plug wire, and lay it aside. Take you're 3/8" spark plug socket, and start going at it. As for the timing belt. You'll have to pull everything off the front to get at it.
The thing you'll need to remember is to bring it all to Top Dead Center before pulling anything. If you don't, it'll be a NIGHTMARE getting your timing right.
I don't know why it says to remove all the spark plugs though. To make sure you're at 0º TDC, you need to pull the #1 plug, and put something LONG down in the cylinder so you can see when the piston is at the top. Turn the crank (w/a 19mm socket) to where the timing pulley lines up with zero on the cover (The cams are also notched and should line up at the same time) (DO THIS WITH THE BELT ON! You need to turn the cams at the same time!). Then make sure that the screw-driver/whatever you used is at the absolute top and that if you turn the crank at all that it goes down. This means you're at 0º TDC. You can then pull the belt and replace it. Make sure you line everything back up when you put it back on.
man i dunno, the 3 and 4 plug where a nightmere. i could barely get my hands/socket under the throttle body to get to the plugs. putting the wire back on the 4 plug was the worst ever. with the throttle body off im sure it would take no time at all.
man i dunno, the 3 and 4 plug where a nightmere. i could barely get my hands/socket under the throttle body to get to the plugs. putting the wire back on the 4 plug was the worst ever. with the throttle body off im sure it would take no time at all.
That's the point :-P The 3000 pipe is 2 Bolts and a clamp. The coil pack is 4 nuts. No big deal. I wouldn't even try it with those on.
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1988 Mk3 Turbo Targa - 17.5psi, 486hp, 494tq.
[img]http://www.**********s.com/supra/rsw_sig_stupidTN.jpg[/img]
Who came up with this 500px wide BS?
That's the point :-P The 3000 pipe is 2 Bolts and a clamp. The coil pack is 4 nuts. No big deal. I wouldn't even try it with those on.
at first look the throttle body seems like it would be more trouble than its worth to remove. according to the manual you need to drain the coolant from it and disconnect the throttle position lever and all that to.
at first look the throttle body seems like it would be more trouble than its worth to remove. according to the manual you need to drain the coolant from it and disconnect the throttle position lever and all that to.
You don't need to remove the throttle body. IF I said you did that was a boo-boo. You just need to pull the 3000 pipe. The TB barely sticks over the valve covers, it's not in the way to pull the plugs. You only need to move the 3000 Pipe, the Small metal pipes attached to it, and the coil pack.
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1988 Mk3 Turbo Targa - 17.5psi, 486hp, 494tq.
[img]http://www.**********s.com/supra/rsw_sig_stupidTN.jpg[/img]
Who came up with this 500px wide BS?
Iwannadie...no offense, but If changing the spark plugs is too much of a hassle...how are you gona change your own timing belt? remember onepiece of advice...DON'T TAKE SHORTCUTS! it RARELY works...and when it does, it usually messes up quicker down tha road!
Iwannadie...no offense, but If changing the spark plugs is too much of a hassle...how are you gona change your own timing belt? remember onepiece of advice...DON'T TAKE SHORTCUTS! it RARELY works...and when it does, it usually messes up quicker down tha road!
well if theres an easier way that i didnt know how to do. according to the shop manual you dont need to remove any part of the throttle body to change the plugs and doing it that way is a major pain. im all for learning the least hassle method of doing it. its not a matter of 'oh its too hard for me ill just half arse it' its just 'wow theres an easier way i didnt know about' kind of thing so ya.... im planning to take as much time as i need to Learn to work on my car, yea changing the timing belt is the deepest ill have been into my motor but also i need to learn. i really hate when people have the attitude 'if you have to ask this question you shouldnt be attempting it'. we all gotta start some where, im not born with knowledge of my car the only way for me to learn is dive in and ask dumb questions.
My good man, not a stupid question at all, from the vibe i got from your typing, the spark plugs were too much of a hassle for you. I said a simple statement, and a piece of friendly advice...do not assume that i am making fun of you, or putting you down...
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