Ok well i bought this really clean 95 auto gt guy said he just put a new dist and ect sensor in it... I ddnt think anything about it bought it and drove it home... I knew when i drove it the power seemed a little flat but whatever the engine ideld perfect didnt miss shifted great ext... Decided to do plugs today since the new dist and plug wired id just do plugs and a fuel filter cause it didnt really run quite like it should i checked the timing and it was WAY retarded like the tdc mark was at 12 oclock when it was sparking with the stint out... so i set it at like 10-11 plugged it back in drove it and damm it spark knocks bad when just easy driving... Ok so i decided it was a lean knock checked fuel filter it was old and plugged put the new on on and still spark knocks... It will only not spark knock if the timing it set with the stint out at like 5* atdc you can drive it easy and it dont knock but if you get on it it still spark knocks.... Like i said it idles perfect dont missfire i have put plugs in it (same plug i took out of it awsf42c's) gapped at .055 i have also cleaned the t body and maf and iat sensor put dialectric on every connector i can unplug without taking the upper off... I checked the vacume 17"'s at an idle... I also disconnected vacume from the fuel press reg and unplugged the ect sensor to force it rich with no help.... If memory serves me correct both stft were like -3 to -5 and ltft was around +13-15 and it had 2 codes it it one in the 180s and one in the 190s 181 and 191 i think... 02's are cycling fine tps and maf seem to be working as they should watching the datastream... I am bumfused unless fuel pressure is low (havt been able to check it yet) on my advance timing light total timing is in the low 20s at an idle and goes up to the high 30s when the engine is brought above and idle so i dont thing its a timing issue! But funnier things have happened.... Driveability is not my strong suit ao and and all help would be great thanks in advance! D.J.
95 5l auto "spark knock" "pinging" problem
- Thread starter Dirtcar75
- Start date
CC'S95GT
Post Whore
welcome to the site, Check you harmonic balancer for wobbling and the timing marks being incorrect. The balancer may have slipped and giving you an incorrest reaading. It's a common problem. (Set #1 to TDC and verify balancer is on 0, and rotor on dizzy is pointing to #1).
Musturd
Post Whore
- Joined
- Feb 12, 2011
- Messages
- 11,222
- Reaction score
- 3,672
Your timing is out for sure this is why it's pinging. The rubber always starts to come out of the balancers on these
86svo9l
Active Member
EGR could be stuck closed also.
quickstang_1994
Well-Known Member
ck for an aftermarket chip, what fuel grade are you running?
Ok after work it didnt seem to spark knock as bad to begin with but i put $30 worth of premium fuel in it and "known good used parts on it" ignition mudule didnt help intake air temp sensor didnt help air meter now its worthy of beeing called a gt! But still spark knocks a little at wot with the timing set at 8-9 degrees i know the wires are bad cause they lit me up! My cousin messes with fox cars and says the plug wires are the culpret... Or the plug gap he says .032-.036 and awsf32's not 42's what do you think? Im heading in the rite direction but still not quite there yet thanks again guys!
kissrocksforever
Active Member
Make sure your flux capaciter is running at 1.21 jigawats too.
JJhirsch
Member
Did you try cleaning your MAF?
Did you really mean 5* atdc? The timing should be correct between 10-14* btdc. Where is the #1 wire on the distributor cap. It should be at about 1 o'clock looking down from the top. The #1 cylinder is passenger side front of engine and firing order is 1-3-7-2-6-5-4-8.
Yes the only way it would not spark knock before the diffrent maf was if it was at 5* adtc dont ask me how it actually ran but thats where the timing was now after i have the diff maf i have it about 6* btdc and it still spark knocks at wot once its up to temp its running like 200-205* u think a cooler t stat would be the beat all fix all?
CC'S95GT
Post Whore
Do you know if your car has an aftermarket cam in it?
86svo9l
Active Member
Does it spark knock at full throttle or just part? 200-205* should not cause trouble, but you can always put a 180* in there and see how it works out. As I stated before, check to see if your EGR is stuck closed, the computer leans out to compensate for incoming exhaust gas, so if it is stuck closed you will get spark knock at part throttle but not full throttle.
![IMG_20140524_152057360_HDR[1]](/data/xfmg/thumbnail/0/66-1b90088565df25d76ff5bd73b7f47142.jpg?1623783787)
