y2k struck my pcm!
Thread Starter
Banned
Joined: Apr 2013
Posts: 105
From: Tri State Area
y2k struck my pcm!
Okay, so I did a little work on my 95 maro' which included cam, injectors, cai, cat back (although no cats), headers, heads, pcmforless tune, lt4 knock module, adjustable accel fuel P. reg. new knock sensor, new temp sensor sending unit (broke it removing the exhaust manifold), new plug wires, opti has less then 5 k miles on it, new clutch.
After all the work was done I let the car run through 3 heat cycles while still on the stands, it started right up ran great with a few quick revs, I was having eargazms. Big day came for the first drive and it was going great. I didn't go far the first drive incase something happened I can push the car home =) but it went great. The next day I thought I'll take it out on the highway and see how the foot to floor experience feels. It went great for a bit, the exhaust tones were good as those wild one night stands but only until the car warmed up. Once it hit 180 (it stayed there to) it started to act up, I would push the gas petal and it wouldn't accelerate then all of a sudden it would just launch like a bat out of hell (think I got whiplash there once). What can cause a surge like this I never ran into an issue like this? I recall the smell of gas being bad but I think the cylinders were getting over loaded.
After all the work was done I let the car run through 3 heat cycles while still on the stands, it started right up ran great with a few quick revs, I was having eargazms. Big day came for the first drive and it was going great. I didn't go far the first drive incase something happened I can push the car home =) but it went great. The next day I thought I'll take it out on the highway and see how the foot to floor experience feels. It went great for a bit, the exhaust tones were good as those wild one night stands but only until the car warmed up. Once it hit 180 (it stayed there to) it started to act up, I would push the gas petal and it wouldn't accelerate then all of a sudden it would just launch like a bat out of hell (think I got whiplash there once). What can cause a surge like this I never ran into an issue like this? I recall the smell of gas being bad but I think the cylinders were getting over loaded.
Last edited by Shangrila; Apr 23, 2013 at 08:44 PM.
Registered User
Joined: Nov 2002
Posts: 4,784
From: Jacksonville
Re: y2k struck my pcm!
You're likely going to need to run a scanning program to figure out exactly what the PCM is up to when it does this unless you just get really lucky with a guess. Personally I would ditch the aftermarket regulator and put the stocker back on.
Registered User
Joined: Jul 2002
Posts: 1,942
From: Kissimmee, Fl, USA
Re: y2k struck my pcm!
Coolant temp sensor in the water pump can lead to over fueling. You can either replace it outright or hook a scanner to the obd port to see what temp the p is seeing. Two things, use only an AC Delco sensor and don't rely on the dash gauge to tell you the temp that the PCM sees as that uses a separate sensor....
Good luck!
Good luck!
Registered User
Joined: Jan 2006
Posts: 778
From: Shillington PA
Re: y2k struck my pcm!
Sounds like as soon as u built temp and went into closed loop...something was no longer functioning properly
Ses light?
im on tapa so i cant see if u have stuff listed in ur sig... are u a maf tune or sd?
Larry (Popo8) Co-owner
LTXtech.com
Ses light?
im on tapa so i cant see if u have stuff listed in ur sig... are u a maf tune or sd?
Larry (Popo8) Co-owner
LTXtech.com
Thread Starter
Banned
Joined: Apr 2013
Posts: 105
From: Tri State Area
Re: y2k struck my pcm!
Great, now I need to find one since EastCoastSupercharing no longer supports LT1s. How much fluctuation is there in the FP on WOT operations?
Thread Starter
Banned
Joined: Apr 2013
Posts: 105
From: Tri State Area
Re: y2k struck my pcm!
Sticker? no
__________________________________________________ ______________
Basic Vehicle Info:
Year 95
Model F
VIN: 2g**************
Broadcast:
Engine Size: 5.7L
__________________________________________________ ______________
Drivetrain Info:
Trans Manual
Built Transmission? stock
Gear 3.46
Current Tire Size stock
Stock Tire Size stock
Shift firmness 0
Torque Convertor none
__________________________________________________ ______________
Fuel System:
Fuel Octane 93
Injector Size 36lb/hr
Injector Make FAST
Injector Rating 43.5 psi PSI
Delete 9th Injector? No
Disable DOD? Not Applicable
__________________________________________________ ______________
General Info: Constants
Speed limiter? Remove
Rev limiter? tuner's choice (recommended)
Thermostat 180
Remove Skipshift? remove
Idle tuner's choice (recommended)
Trouble Codes? remove EGR, remove AIR
Elevation? 150'+
Towing? no
Electric Fan stockfan
__________________________________________________ ______________
Engine:
MAF
MAF Ported? No
MAF Descreened? No
Throttle Body stock
Cold Air Intake cai
Intake Manifold portedlt1
__________________________________________________ ________________
Exhaust:
Exhaust longtubes
Catback aftermarket
Remove Cat Yes
__________________________________________________ ______________
Engine
Camshaft Aftermarket(Specs are for 1.5 rockers)
Duration 237 , 237
Lift 560, 560
LSA 110
Advance .
__________________________________________________ ______________
Head Info
Port and bowl work
Compression stock:11:1
Displacement 350ci CID
Rocker 1.6
__________________________________________________ ______________
MISC
Nitrous no
Nitrous Amount
Timing Retard Box? no
Wet or Dry? .
__________________________________________________ ______________
Other information
Last edited by Shangrila; Apr 24, 2013 at 06:45 AM.
Thread Starter
Banned
Joined: Apr 2013
Posts: 105
From: Tri State Area
Re: y2k struck my pcm!
I'll double check the firing order, check and make sure the plug wires have good contact, replace the temp sending since it's only a few dollar item and maybe the knock sensor, I might of over tightened the knock sensor. It really sounds like the timing is jumping, it has not backfire so I can almost rule out firing order or bad wires plus it runs smooth (well as smooth as a 110lsa can). The car starts right up hot or cold on first try. I'll also have to look into maybe fuel pressure as mentioned above it might be the regulator. I checked the FP when I started it looked healthy right at 43-44 psi. I attached the gauge to the schrader valve and I can't see it during WOT as to what it's doing, but on the revs parked it was fine.
Last edited by Shangrila; Apr 25, 2013 at 06:22 AM.
Registered User
Joined: Jan 2006
Posts: 778
From: Shillington PA
Re: y2k struck my pcm!
I went thought the obvious many times but I sent out my pcm to have it recalibrated for the new cam since it changed during the build. I just wanted to eliminate the possibility of it being cam surge. Should have it back Saturday latest Monday and see what happens.
I'll double check the firing order, check and make sure the plug wires have good contact, replace the temp sending since it's only a few dollar item and maybe the knock sensor, I might of over tightened the knock sensor. It really sounds like the timing is jumping, it has not backfire so I can almost rule out firing order or bad wires plus it runs smooth (well as smooth as a 110lsa can). The car starts right up hot or cold on first try. I'll also have to look into maybe fuel pressure as mentioned above it might be the regulator. I checked the FP when I started it looked healthy right at 43-44 psi. I attached the gauge to the schrader valve and I can't see it during WOT as to what it's doing, but on the revs parked it was fine.
I'll double check the firing order, check and make sure the plug wires have good contact, replace the temp sending since it's only a few dollar item and maybe the knock sensor, I might of over tightened the knock sensor. It really sounds like the timing is jumping, it has not backfire so I can almost rule out firing order or bad wires plus it runs smooth (well as smooth as a 110lsa can). The car starts right up hot or cold on first try. I'll also have to look into maybe fuel pressure as mentioned above it might be the regulator. I checked the FP when I started it looked healthy right at 43-44 psi. I attached the gauge to the schrader valve and I can't see it during WOT as to what it's doing, but on the revs parked it was fine.
Larry (Popo8) Co-owner
LTXtech.com
Thread Starter
Banned
Joined: Apr 2013
Posts: 105
From: Tri State Area
Re: y2k struck my pcm!
I'll get the double one, that cd holders is sooooo useless.
Registered User
Joined: Sep 2001
Posts: 4,152
From: Woodstown, NJ
Re: y2k struck my pcm!
I'm to **** for Sanford and Son methods =). I'll just do it the right way and get the sending unit. I seen these 1993-1996 Camaro Cassette/CD Holder Panel TWO GAUGE HOLES, 6LE Designs LLC
I'll get the double one, that cd holders is sooooo useless.
I'll get the double one, that cd holders is sooooo useless.
It's also rude to insult other people's diagnostic methods especially when it's been done by just about everyone for YEARS.
Thread Starter
Banned
Joined: Apr 2013
Posts: 105
From: Tri State Area
Re: y2k struck my pcm!
It's common practice for short-term diagnostic purposes to temporarily tape the gauge to the windshield for a few minutes while going for a drive.
It's also rude to insult other people's diagnostic methods especially when it's been done by just about everyone for YEARS.
It's also rude to insult other people's diagnostic methods especially when it's been done by just about everyone for YEARS.
Registered User
Joined: Jan 2006
Posts: 778
From: Shillington PA
Re: y2k struck my pcm!
I'm to **** for Sanford and Son methods =). I'll just do it the right way and get the sending unit. I seen these http://6litereaterdesigns.com/store/...products_id=63
I'll get the double one, that cd holders is sooooo useless.
I'll get the double one, that cd holders is sooooo useless.
It's common practice for short-term diagnostic purposes to temporarily tape the gauge to the windshield for a few minutes while going for a drive.
It's also rude to insult other people's diagnostic methods especially when it's been done by just about everyone for YEARS.
It's also rude to insult other people's diagnostic methods especially when it's been done by just about everyone for YEARS.
Thanku...someone who gets their hands dirty would know that...
Im not insulted. I know what Im doing. Thats why even when my shyt breaks....I CAN FIX IT.
GOOD LUCK WITH IR ****.
Larry (Popo8) Co-owner
LTXtech.com
