just installed my 7mgte motor in mk 3 supra 87. 5spd. motor has built internal. c pics. but other wise stock. just wantd to get it runing stock before i put the new turbo, intake ect on. anyways everything is bck together and i have 0 spark. checked to c if ignitor has power and it does but no spark anyhelp would be great
no spark!!!
- Thread starter JamesB
- Start date
thanks. basics basics basics. did a draw test from neg bat cable disconected to neg bat terminal. and got power.... now the fun begins trying to locate the draw. any common problem areas? tomorrow i will start the process off elimination " unpluging and checking all components " until i find the draw.LordLo said:
From all the engine changes and headgasket changes that I've done, people tend to forget to reattach the engine ground on the intake manifold that sits close to the VSV.
When that ground wire isn't connected, the car will do funny things. For example, a supra I worked on would fire up and run fine, but then it would randomly lose power to the coil pack. Found out it was because of the ground wire I mentioned above was not connected.
When that ground wire isn't connected, the car will do funny things. For example, a supra I worked on would fire up and run fine, but then it would randomly lose power to the coil pack. Found out it was because of the ground wire I mentioned above was not connected.
are you refering to the body ground that goes from " roughly" the exaust side of head, near cyl number 6 to the fire wall? or something else? worked on it again today and could not find the draw..... a first for me. i am stumped, do you think it could have something to do with the cam sensor and or timing? that is for the spark issue, not ground......
Of course a lack of ignition could be caused by a bad ground but measuring parasitic draw off the Mother Of All Grounds is not going to find it. If the main ground was bad nothing would be working and the engine certainly wouldn't crank. Since I'm assuming the CEL comes on with the key you must have the ECU ground at the intake manifold hooked up. If my assumption is wrong start there.
Assuming the coil packs are OK and powered all that's needed for spark is power and ground to a healthy ECU, a CPS signal, a good igniter, and good wiring. Here's another tip: pull the CPS out so you can spin it by hand while troubleshooting. No point is cranking the engine all the time. Be sure you put it back in right when done. For reasons I've never been able to fathom that simple task seems to stump many people.
Assuming the coil packs are OK and powered all that's needed for spark is power and ground to a healthy ECU, a CPS signal, a good igniter, and good wiring. Here's another tip: pull the CPS out so you can spin it by hand while troubleshooting. No point is cranking the engine all the time. Be sure you put it back in right when done. For reasons I've never been able to fathom that simple task seems to stump many people.
jetjock said:
wear exactly is the ecu groung on the intake?
i performed a check on the cps today and found that it is defective. tomorrow will instal new cps nd try for spark.
are u saying chck for spark by spinning the cps by hand? can u give me that procedure if possible? thanks or your help.
by the way youre car looks great
It bolts on the intake manifold in line with cyl 5 in 6 down under the intake where the intake bolts on.
The procedure involves holding the CPS in one hand and spinning the gear with the other. Highly technical stuff.
You be welcome. I'm a Masshole myself. Plymouth born and raised. You know, the place where the Pilgrims first set foot on Fraggle Rock
. And no, Thanksgiving is not my favorite holiday. If I ever see anything Pilgrim related again it'll be too soon...
You be welcome. I'm a Masshole myself. Plymouth born and raised. You know, the place where the Pilgrims first set foot on Fraggle Rock
. And no, Thanksgiving is not my favorite holiday. If I ever see anything Pilgrim related again it'll be too soon...jetjock said:The procedure involves holding the CPS in one hand and spinning the gear with the other. Highly technical stuff.
You be welcome. I'm a Masshole myself. Plymouth born and raised. You know, the place where the Pilgrims first set foot on Fraggle Rock
nice to know your a masshole as well ,now that you mention it that procedure does sound very compex, can u get me a picture to help me find the Cars Power steering (cps) and which ger should i be spining in ? no seriously thanks for the tip im sure it will make it alot easier sence im working on the car alone,99 % of the time.
One of the problems i ran into while putting my car back together was the cps to harness connector. the prongs themselves were slipping out not making contact. sometimes it would start, other times it wouldn't. I killed 2 batteries (constantly draining & recharging) doing this.