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| IT WONT START!!! (Page 2/3) |
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BruhMans06
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JUL 07, 08:46 PM
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| quote | Originally posted by cartercarbaficionado:
did you check that the new sensors are reporting correctly? also not idling is in my experience with 84s usually the computer being weird after replacing sensors
also do try the old map sensor and such until it idles again |
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hopw would I check if sensors are reporting correctly? I have no idea where my old MAP sensor is as I replaced that thing probably 7 months ago, but i could buy a new one to see if that works.
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Patrick
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JUL 07, 09:33 PM
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| quote | Originally posted by BruhMans06:
how would I check if sensors are reporting correctly?
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The same way we all (should) do... with a scanner and/or WinALDL. Otherwise you're trying to tackle this task blind.
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cartercarbaficionado
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JUL 08, 04:27 AM
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| quote | Originally posted by BruhMans06:
hopw would I check if sensors are reporting correctly? I have no idea where my old MAP sensor is as I replaced that thing probably 7 months ago, but i could buy a new one to see if that works. |
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main ones you can check are the tps sensor and stuff like that. something that gets a voltage and gives a voltage back
we will say the map is good for now... have you tried giving it starting fluid to see if it backfires or starts up then sputters and dies? if it does nothing then that tells us quite a bit as well
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Dennis LaGrua
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JUL 08, 01:25 PM
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Remove valve cover. Crank engine. Do you see the rockers move? If not the nylon camshaft gear has stripped out. This is common on the Fiero Duke engines. Replacement is not hard just an all day job. ------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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BruhMans06
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JUL 08, 07:51 PM
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| quote | Originally posted by Dennis LaGrua:
Remove valve cover. Crank engine. Do you see the rockers move? If not the nylon camshaft gear has stripped out. This is common on the Fiero Duke engines. Replacement is not hard just an all day job.
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so I doubt that the cam shaft is busted since the engine still runs, but only when I give it a little gas. the only issue I can think of happening to the cam is either the valves on one of the cylinders are stuck, or the cam lobe is stripped, or the push rod is bent. all of which I severly doubt would happen.
im in the process of getting winALDL and the usb to obd1 will arrive next week so ill be able to see whats wrong with the computer soonish.[This message has been edited by BruhMans06 (edited 07-08-2024).]
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Dennis LaGrua
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JUL 08, 08:16 PM
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| quote | Originally posted by BruhMans06:
so I doubt that the cam shaft is busted since the engine still runs, but only when I give it a little gas. the only issue I can think of happening to the cam is either the valves on one of the cylinders are stuck, or the cam lobe is stripped, or the push rod is bent. all of which I severly doubt would happen. |
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The title of this thread is It Wont Start. The content here now says otherwise. Time to borrow, rent or buy an ALDL scan tool. That should get you closer to identifying the problem. Perhaps a member here can run over and do the scan for you. It only takes a few minutes to do so.
Just guessing, it sounds like a fuel starvation problem.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE " [This message has been edited by Dennis LaGrua (edited 07-08-2024).]
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cartercarbaficionado
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JUL 09, 12:22 AM
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| quote | Originally posted by Dennis LaGrua:
The title of this thread is It Wont Start. The content here now says otherwise. Time to borrow, rent or buy an ALDL scan tool. That should get you closer to identifying the problem. Perhaps a member here can run over and do the scan for you. It only takes a few minutes to do so.
Just guessing, it sounds like a fuel starvation problem.
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actually he has to hold the throttle to keep it running. that ain't fuel starvation. that's more likely too much fuel or a stuck iac.
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BruhMans06
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JUL 09, 09:02 PM
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| quote | Originally posted by cartercarbaficionado:
actually he has to hold the throttle to keep it running. that ain't fuel starvation. that's more likely too much fuel or a stuck iac. |
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see this is why im confused since everything on both the fuel system and throttle body (mosly) are new. I think the only part ive skipped over is the fuel regulator, which i actually inspected at one point and saw no issues with it (no tears and the spring moved freely) but I have a new IAC thats maybe a month old. Ill find out if any of the parts ive bought are duds or not.
Ill be able to actually see what the car is doing once I get my ALDL cable this week. So ill find out.
now that i think about it i guess my fuel regulator could cause some issues between now and when I last checked it... :P[This message has been edited by BruhMans06 (edited 07-09-2024).]
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Patrick
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JUL 09, 09:35 PM
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| quote | Originally posted by BruhMans06:
So I ended up replacing the fuel pump that was rated for 13 psi rather then the stock psi, I also ended up replacingh some of the lines.
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And how quickly does the fuel pressure drop when the fuel pump stops? It shouldn't drop, not for quite awhile. If it does drop immediately/quickly, then possibly the fuel pressure regulator diaphragm is leaking fuel into the throttle body.
| quote | Originally posted by BruhMans06:
now that i think about it i guess my fuel regulator could cause some issues between now and when I last checked it... :P
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BruhMans06
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JUL 09, 11:00 PM
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[QUOTE]Originally posted by Patrick:
And how quickly does the fuel pressure drop when the fuel pump stops? It shouldn't drop, not for quite awhile. If it does drop immediately/quickly, then possibly the fuel pressure regulator diaphragm is leaking fuel into the throttle body.
[QUOTE]Originally posted by BruhMans06:
ok, so I dont remember the pressure dropping much, i left the tester on the engine for maybe 15 minutes and the lowest it dropped to was 9 psi. so I guess that might rule out the regulator
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