Hey guys, trying to track down a noise in my 5 speed 88 Fiero 2.8l. When accelerating from 3rd (a little hard) 4th and especially 5th the car makes a noise that sounds like it has metal shardes stuck in the engine or tranny, or a cell phone breaking up with static. Has anyone else heard of or had this issue?i dont hear it in 1st or second... Im also still lacking some low end torque power...wondering if it could be related...
also my engine temp randomly gets hot (like halfway to max sometimes) then goes back down to normal in 5 seconds. or sometimes goes 1-3 ticks above normal operating temp. Never completely overheats though
Another weird symptom is my oil pressure guage idles low....when the engine is started cold, i get full pressure...driving it sits around the halfway mark or higher when warm...but when its warm at idle, the needle like to dance and almost goes into the red...oil sender unit was replaced a few years ago.
It might be worth checking your timing. Spark knock will show up more readily in the higher gears. Also check the heat shields around your exhaust crossover and slave. Also check your cv joint boots to be sure you haven't ruptured one and lost all the lube.
Temp gauge fluctuations could be due to low coolant.
Google "Getrag rattle". I think you'll find your answer there....
Temp sounds like a residual bubble in the cooling system. May have to perform a full burp (including the heater core).
Do not go off the oil pressure gauge to determine oil pressure, even with a new oil sender. Remove the oil pressure sending unit and hook up a mechanical gauge to the feed tube. Read pressure from that at hot idle.
i honestly dont undertand, no cat converter, exhaust system has no leaks.
Patrick made a joke... he asked about your catalyst and you didn't have one, so then he made polyseme joke, turned cat into an animal and asked about your dog.
Quite humorous, really...
[This message has been edited by carbon (edited 02-13-2014).]
The sound could be detonation. It might only occur under certain load conditions. This happens a lot on 2.5L Fieros with clogged EGR valves. I don't know about the 2.8.
Hey guys, trying to track down a noise in my 5 speed 88 Fiero 2.8l. When accelerating from 3rd (a little hard) 4th and especially 5th the car makes a noise that sounds like it has metal shardes stuck in the engine or tranny, or a cell phone breaking up with static..
Depending on your rpm when you are shifting this could also be normal, you might be "dogging" the engine, trying to accelerate while in to high of a gear. When you get this what rpm just before you shift to the next gear? Pinging is another good chance.
I don't believe im dogging the engine, i know accellerating hard out of 5th gear with a low rpm is now efficient, but i also know what sound my engine normal makes if i do that...this is def not it. Pinging might make sense though, i'll have to check my timing...i just drove to work...in 4th and 5th gear i got the noise at about anywhere from 1200 rpm to 1600 rpm, then it goes away. if i accel VERY slowly i can make it not happen. But say your crusing at 60 kph...car infront of you slows to turn...you slow down just for a momen, then accell away? i dont accell very fast in 4th or 5th, but i NEVER get that noise normally.
I pressed my cluch pedal down a bit to see if that would change anything, and sure enough it did? but i dont know if its because i took load off the tranny or engine...and it only stops when the clutch disengages from the tranny and my rpm shoots up. sitting in neutral and raising my rpms to 3k doesnt make the noise.
I had the timing done twice...but im unsure it was done correctly.,.jumping the a&b terminals in the obd port then setting the timing...i check it again
Muffler? Exhaust hanger springs broken/loose? The Fiero exhaust is pretty raspy already, and a loose exhaust will exacerbate the noise.. And it can sound a bit like a rattle or grinding sound.
Yeah i thought about that too, i took the car to a muffler place 9really good mechanics there) and they found a leak in the flex joint...but no other leaks...or broken hangers...ect.
...in 4th and 5th gear i got the noise at about anywhere from 1200 rpm to 1600 rpm, then it goes away. if i accel VERY slowly i can make it not happen.
This part makes me still think it could still be normal, thats pretty low rpms. But only you could tell, being the driver. Did it not do this before and just started doing it? Is this car new to you?
[This message has been edited by 2.5 (edited 02-13-2014).]
No it did not do this B4, i spent 2 years doing a frame swap...engine has not changed...tranny did, i had a 4 speed...now i have a 5 speed getrag out of a 92 sunbird with dickmans shift conversion kit. Car was saftied, no check engine lights, engine seems to be okay, except it seems to be lacking low end power...like im draggin a weight. And the tranny was swapped.
The ONLY things i did to the engine, were disassemble the egr, intake manifolds, both upper and lower, removed fuel lines to clean the engine. I was told after i had a big vaccume leak under my lower intake manifold, so i replaced the gasket and torqued everything down...havnt had it smoke tested yet to make sure the leak is gone.
But yeah, NEVER did this before. im very sensitive to things like this...noises and feelings, and when things are supposed to happen and when there not. This is def not normal. I know the sound my engine makes if its dogging...but this isnt it.
My 88 Getrag actually has a "getrag rattle", but it only happens in neutral with the clutch not depressed. Never any other time. I have been told possibly input shaft bearing.
Make sure you ahve the right amount of Synchromesh fluid in the tranny.
[This message has been edited by 2.5 (edited 02-13-2014).]
No it did not do this B4, i spent 2 years doing a frame swap...engine has not changed...tranny did, i had a 4 speed...now i have a 5 speed getrag out of a 92
I have a 2000 Saturn SL with a 5 speed manual that does what you describe too, but its not detonation/pinging. I think it actually sounds like a gear or spacer or someting inside rattling but I havent worked on a tranny myself before. I just rev up the shifts higher. The saturn guys say dont shift before 2500rpm anyway. Its annoying sound but not tranny ending.
A quick test for your pinging is try a higher octane and see if it goes away.
[This message has been edited by 2.5 (edited 02-13-2014).]
if it happenes to be a gear rattling or something loose like u say, is there any chance that can be fixed WITHOUT removing the tranny?....*fingers crossed..*
Originally posted by 2.5: My 88 Getrag actually has a "getrag rattle", but it only happens in neutral with the clutch not depressed. Never any other time. I have been told possibly input shaft bearing.
On a side note, my Getrag also exhibits this behavior, exactly as you described it. And it's a rebuilt transmission with a new input shaft bearing / seal unit. So while the rattle may be due to play in the input shaft bearing, it seems like that play is built into it.
As for the OP, I'm guessing spark knock. But I'm not really certain.
Just drove it home with some 91 octane in it....now my gas tank was at about half, and i filled it to 4/3 with premium, but if i had to guess...it did help the noise?...i could step on it a bit more and it didnt make the noise, but it still did....it was softer though and not as long. like it decreased the noise about 50% or so.
