still overheating and being weird (Page 15/16)
cartercarbaficionado AUG 14, 05:03 AM

quote
Originally posted by Yellow-88:


Something interesting going on here.

Always bad new parts, and now "... every shop for a 500 mile radius are crooks ...".

Do you have a mirror that you can look in? I know it's wicked scary but .....


no it shattered from how ugly I am unfortunately.
have you tried any of the affordable parts these days? we get maybe a week out of em before they fail (we is me and my buddies so that's a sample size of around 20 people all installing it themselves or paying a shop to get it done faster)
yeah shops around here are. I just saved a truck from one because they screwed up the whole front end and ended up hacking out the rivets to the leaf spring mount and giving up when they couldn't get it off.
well apparently they ended up attacking the cab mount instead so I had to do it right and fix their jank so yeah.
1985 Fiero GT AUG 14, 06:14 AM

quote
Originally posted by cartercarbaficionado:

mph. it's the high geared 4 speed and I've had a GPS and laser tell me how fast I was going.
I also left a subaru in the dust without realizing it since they couldn't keep up at the top end



High geared as in the 84 economy gearing? There were only 3 4 speeds, 84 economy, 84 performance, and v6 one) Unless there's a LOT done to the 2.8 it isn't going 160mph, it can't, any higher gearing and it becomes power limited (the 4 speed let's it rev all the way out, with the tiny gearing change to the getrag 5 speed, like 150rpm at 70mph difference, and the engine won't rev out. A stock 2.8 will get up to 125mph, modified a lot, I wouldn't question 135, 160 though? That's not possible with this engine unless it's dropped from a plane. What rpm are you turning at 60mph exactly?
82-T/A [At Work] AUG 14, 07:58 AM

quote
Originally posted by 1985 Fiero GT:

That's not possible with this engine unless it's dropped from a plane. What rpm are you turning at 60mph exactly?




Hahah!!!

One time in my youth, I had my Fiero floored... wanted to see how fast it would go, and the needle went past the 120 mark, to what would have likely been 130 had it been on the speedometer. I had a few modifications to the stock 2.8 at the time, including the ThermoMaster chip (no idea what that did), hogged out exhaust manifolds, 1.52:1 roller rockers, port-matched intake components, a higher-flowing cat, K&N air filter (ok, look...), and the Ocelot exhaust system.

This was with a GX3, 3.33:1 final drive Th-125c, and the RPMs on the tach showed around ~4,800 or so if I remember correctly. Redline is at 6k, but with the pedal floored, and it being a mild Florida spring morning (about mid 70s with low humidity), the car just wouldn't go any faster. It was floored... the output of the engine could not overcome the wind and rolling resistance to make it go any faster.
1985 Fiero GT AUG 14, 11:29 AM

quote
Originally posted by 82-T/A [At Work]:
Hahah!!!

One time in my youth, I had my Fiero floored... wanted to see how fast it would go, and the needle went past the 120 mark, to what would have likely been 130 had it been on the speedometer. I had a few modifications to the stock 2.8 at the time, including the ThermoMaster chip (no idea what that did), hogged out exhaust manifolds, 1.52:1 roller rockers, port-matched intake components, a higher-flowing cat, K&N air filter (ok, look...), and the Ocelot exhaust system.

This was with a GX3, 3.33:1 final drive Th-125c, and the RPMs on the tach showed around ~4,800 or so if I remember correctly. Redline is at 6k, but with the pedal floored, and it being a mild Florida spring morning (about mid 70s with low humidity), the car just wouldn't go any faster. It was floored... the output of the engine could not overcome the wind and rolling resistance to make it go any faster.



Yeah, the higher the gearing, it becomes power limited, I think the regular 4 speed takes it up to the maximum speed right close to the redline, still power limited, but using every available rpm haha, also the speedos become quite inaccurate at higher speeds, so if it "showed" 130, it would have likely still been right around 125. Slightly modified, if believe 130 or even 135, if GPS measured, 160, there's literally no possible way.
cartercarbaficionado AUG 14, 03:30 PM

quote
Originally posted by 1985 Fiero GT:


High geared as in the 84 economy gearing? There were only 3 4 speeds, 84 economy, 84 performance, and v6 one) Unless there's a LOT done to the 2.8 it isn't going 160mph, it can't, any higher gearing and it becomes power limited (the 4 speed let's it rev all the way out, with the tiny gearing change to the getrag 5 speed, like 150rpm at 70mph difference, and the engine won't rev out. A stock 2.8 will get up to 125mph, modified a lot, I wouldn't question 135, 160 though? That's not possible with this engine unless it's dropped from a plane. What rpm are you turning at 60mph exactly?


2300 rpm in 4th at 60 mph. when i hit 3k I'm doing 70 and just below 4 I'm doing 100 mph. this engine does have a Dawg mod intake and no cat (and now a stainless exhaust) and all I know is that the car is nippy above 3k and I was very much faster than the subaru that was doing 120 against its limiter and staying ahead of a camry doing 140 (don't tell me a 2007 v6 camry cannot do 140 because I know for a fact with the track trim it can and will)
I wasn't trusting the fiero speedo so I've been using a GPS one both on my phone and a secondary stand alone part.

[This message has been edited by cartercarbaficionado (edited 08-14-2024).]

cartercarbaficionado AUG 30, 05:04 AM
well finally made time for this issue and car again. it's getting put back together with a Rodney's low temp fan switch. (don't lecture me about it. the cooling system is completely fine 90 percent of the time until it suddenly isn't and a little more warning would be nice without needing to constantly babysit it.) new gauge sender and the entire interior was removed to find some wiring issues and get make it fit a little better. the hope is to have the bumper put back on temporarily until I get the new aero signals from the fiero store to let me use the new 88 coupe front.
I have figured out some of the reason for overheating and the high idle issue this car has had on and off... yeah it was the stupid egr tube splitting In half. as for the garbage running and fuel economy im gonna dig into my stash for a gm genuine icm that I have personally tested on a vehicle that uses the same distributor parts (4.3l cpi incase you were wondering) and I'll see if that helps like it usually does since I do have a few map sensors as well if it decides those are not reporting within range. also considering a few delete parts for some common issues. namely the throttle body coolant lines and cold start injector but I'll likely leave the latter installed
Yellow-88 AUG 31, 10:26 AM

quote
Originally posted by cartercarbaficionado:

well finally made time for this issue and car again. it's getting put back together with a Rodney's low temp fan switch. (don't lecture me about it. the cooling system is completely fine 90 percent of the time until it suddenly isn't and a little more warning would be nice without needing to constantly babysit it.) new gauge sender and the entire interior was removed to find some wiring issues and get make it fit a little better. the hope is to have the bumper put back on temporarily until I get the new aero signals from the fiero store to let me use the new 88 coupe front.
I have figured out some of the reason for overheating and the high idle issue this car has had on and off... yeah it was the stupid egr tube splitting In half. as for the garbage running and fuel economy im gonna dig into my stash for a gm genuine icm that I have personally tested on a vehicle that uses the same distributor parts (4.3l cpi incase you were wondering) and I'll see if that helps like it usually does since I do have a few map sensors as well if it decides those are not reporting within range. also considering a few delete parts for some common issues. namely the throttle body coolant lines and cold start injector but I'll likely leave the latter installed



So... the bottom line is that it's still overheating and being weird. Even if it's only sometime. That's technically an "intermittent" and is for sure the most aggravating kind of problem, and unfortunately, your shotgun style of problem solving is the least effective approach, especially for intermittents.

"... as for the garbage running and fuel economy ..." There are really just 2 functions affecting that. Fuel and ignition. I know that you have both the tools and the knowledge to isolate the problem, if you follow a structured approach. I know that focus is a bit difficult for you and that's not criticism. Learning to focus is a skill that takes effort. Take a step back and try to focus.
cartercarbaficionado AUG 31, 06:49 PM

quote
Originally posted by Yellow-88:


So... the bottom line is that it's still overheating and being weird. Even if it's only sometime. That's technically an "intermittent" and is for sure the most aggravating kind of problem, and unfortunately, your shotgun style of problem solving is the least effective approach, especially for intermittents.

"... as for the garbage running and fuel economy ..." There are really just 2 functions affecting that. Fuel and ignition. I know that you have both the tools and the knowledge to isolate the problem, if you follow a structured approach. I know that focus is a bit difficult for you and that's not criticism. Learning to focus is a skill that takes effort. Take a step back and try to focus.


I have no idea how it runs currently actually. I haven't touched the car in a few months but it's getting alot of tested parts from a 87 2.8 engine and trans assembly I got recently since I needed some bits for my 87 gt as well. (namely the throttle body since it's one is actively disintegrating and will be tig welded back together to seal it up for the spare engine sitting on a crate)
and I had this 88 not overheating for months yellow. it didn't get mentioned on the forum for almost a year since it was running and driving fairly well after it got New upper intake gaskets and head gaskets and then fell on its face one night and drove home needing to stop every 30 minutes and cool off. I've replaced any parts that measured faulty which has been pretty much everything in the ignition and fuel system within that year and finally I've got a new tested ecm to try since the one in the car clearly has no idea what it's doing (engine will run great and then suddenly backfire which was happening more and more as I fixed vacuum leaks that were popping up from the previous owners repairs like the entire plastic vac lines were sliced at the ends but superglued back together for some reason) and I know it's throwing timing at the engine and seeing what sticks in a buckshot approach since I got an aldl scanner from a old mechanic shop closing and I wish I was kidding but it was going from 14 degrees at full throttle to 30 at random and the same throttle and load values so yeah. the shotgun approach I have just seems that way because every square inch of this car has been cobbled together and so far its down to the engine and electrics instead of everything but the frame basically falling apart.
cartercarbaficionado SEP 01, 03:01 AM
cooling pipe has a crack in its repair peice
so thats been a issue for an unknown amount of time
Yellow-88 SEP 01, 06:13 PM
So ... You have 3 Fieros? Two 87's and one 88?
Maybe give then names so it's easer to tell which one you're talking about. Tangerine is the 88 correct?