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July 2nd, 2008, 01:27 PM
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GN dies on freeway at 70mph
Hey, guys. Was driving the new combination down the freeway and all the sudden it went *POP* *POP* *POP* and chugged a couple times, and then shut off. I dropped it in nuetral and coasted to the shoulder. I got out popped the hood and saw nothing out of place. I got off the freeway and onto a local highway and it did it to me one more time on the way home.
Any thoughts on cause? The tune looked okay. I'll get scanmaster readings up asap. I was wondering if the car could be running in a lean condition with that happening. Or possibly this new mix of E10 gas we're getting now.
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Sean Thomas 1986 GN Astroroof Comp Cam 212/218, .463/.471, 110LSA, billet center mains, TRW pistons, stock crank/rods, Ported stock heads/intake, ARP studs throughout, PTE DBB 6262 S cover, RJC pp, GBP 3.5" DP w/3.5" dump pipe, Z06 3.75" MAF, RJC 4" intake, KN filter, dutt-neck IC, TT alky chip, Razor's Alky, Walbro 340, Acufab FP reg, 50# MSD inj, Iceman UCA/LCA's, Scanmaster, trans +, Hooker 2.5" duals, BH TH200-4R, WCC 3000 Stall LO. 
    
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July 2nd, 2008, 01:31 PM
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Coilpack/module?
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1987 Buick GN Currently getting freshened up.... Old Parts: 60# injectors, 3" TH DP with test pipe and hooker cat back, Walbro 340 pump, Razor's Alky, TT Chip, 3-1/2" MAF pipe with Big Mouth CA Kit and LS1 MAF, Translator.... yada yada New parts: Ported heads with stainless valves, RJC FMIC, T&D 1.65 roller rockers, Comp XR2 Hydraulic Roller 210/215@.050 .549/.549 (with 1.65 rockers), champion ported intake, Hemco stock appearing doghouse, PT70 P-trim turbo with H comp. housing, N/A109 block bored .030 over with head studs, main studs #2 and #3 billet main caps, cometics, TRW forged .030 over slugs with hastings moly rings. New times soon. (1/8) 8.002 @ 86 mph 12.650 @ 106 mph with a 1.71 60' time with the stock turbo/dutt neck intercooler (best mph was 107.69 mph)
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July 2nd, 2008, 06:54 PM
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Lean cruise too lean?
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87 WE4.. NO exhaust leaks!!!! (Remflex.com), now with 1/4 e.t.: (13.1 @ 102)(2.2 60')...stock motor/ bolt-ons, lots left in it, great tranny (Dave Splett), enjoying the daily drive!
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July 2nd, 2008, 07:36 PM
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Both good suggestions. Pulled a plug and it looks lean. I'm going to fatten it up a little. Thanks.
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Sean Thomas 1986 GN Astroroof Comp Cam 212/218, .463/.471, 110LSA, billet center mains, TRW pistons, stock crank/rods, Ported stock heads/intake, ARP studs throughout, PTE DBB 6262 S cover, RJC pp, GBP 3.5" DP w/3.5" dump pipe, Z06 3.75" MAF, RJC 4" intake, KN filter, dutt-neck IC, TT alky chip, Razor's Alky, Walbro 340, Acufab FP reg, 50# MSD inj, Iceman UCA/LCA's, Scanmaster, trans +, Hooker 2.5" duals, BH TH200-4R, WCC 3000 Stall LO.
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July 2nd, 2008, 07:57 PM
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"FOR SALE" 1968 LC2 Powered Chevelle Scanmaster TT 92 Chip Dutt neck OE IC Stock rebuilt Turbo Adjustable actuator Adjustable FP reg. 340M Hot Wired RJC Power Plate 200-4R built by Earlys D5 with heavy duty bearing 2.5 Exhaust worst time a 17.99  backed up by a 17.91 1966 Mustang all Original, Rebuilt Engine, Fresh paint, lots of new parts pictures by request (For sale) 1987 Turbo Regal - http://www.turbobuick.com/forums/car...rbo-regal.html
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July 3rd, 2008, 12:39 AM
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Same thing happened to me last summer, it was the ignition module. It seemed to be heat related - The car would die and after waiting for 15-30 minutes it would start up again.
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July 3rd, 2008, 12:52 AM
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Sounds like a module...same thing happened on our way back from Turbo Thunder in Woodburn a few years ago to one of our GNRA members, I had a spare and we changed it out on the side of the road, they then drove all the way to Canada and back home to Sacramento without any more problems.
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1987 Grand National & The Original "Quick 6 Racing" from the Pacific NorthWest Division 6 N.H.R.A member since 1991 G.N.R.A Member since 1993 11.49 et @ 116 mph on BFG Drag Radials Retired from racing with 1500+ 1/4 mile passes and lots of trophies, car still runs very strong on the street every chance I get.
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July 3rd, 2008, 01:51 AM
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Interesting stuff. Thanks. The ignition module is brand new. The coil pack appears to be pretty old. Speaking of heat, I have the low speed fan disconnected, and the high speed runs all the time. Even at high speed, with the stock fan, the temps range from 190-200* when it's in the 90's here, which it frequently is. I'm not woundering if they 'new heat' from the new combo is now killing my car. Used to be, with the old combo, the worst it ever got was 180 on a really hot day. I'll check these out one at a time.
As for the popping it sounded like an explosion in the exhaust right down by the test pipe. If it was a hanging exhaust valve it would do it all the time, but this has happened only twice on an extended cruise, 40+ miles, on a really hot day. Timing problem? Never happened before, hasn't happened since. Like I said, it felt like it was running out of fuel. Fuel pressure appeared to be fine. I don't know. This E10 fuel is junk and I've heard of lots of similar problems. Fuel filter is brand new. Thanks again....
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Sean Thomas 1986 GN Astroroof Comp Cam 212/218, .463/.471, 110LSA, billet center mains, TRW pistons, stock crank/rods, Ported stock heads/intake, ARP studs throughout, PTE DBB 6262 S cover, RJC pp, GBP 3.5" DP w/3.5" dump pipe, Z06 3.75" MAF, RJC 4" intake, KN filter, dutt-neck IC, TT alky chip, Razor's Alky, Walbro 340, Acufab FP reg, 50# MSD inj, Iceman UCA/LCA's, Scanmaster, trans +, Hooker 2.5" duals, BH TH200-4R, WCC 3000 Stall LO.
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July 3rd, 2008, 02:12 AM
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Hope it's something simple and easy to fix. Do you have your fan running even while you're on the freeway?
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July 3rd, 2008, 03:08 AM
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Yes, I think it does. Comes on at 160* and what temp do they shut off at?
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Sean Thomas 1986 GN Astroroof Comp Cam 212/218, .463/.471, 110LSA, billet center mains, TRW pistons, stock crank/rods, Ported stock heads/intake, ARP studs throughout, PTE DBB 6262 S cover, RJC pp, GBP 3.5" DP w/3.5" dump pipe, Z06 3.75" MAF, RJC 4" intake, KN filter, dutt-neck IC, TT alky chip, Razor's Alky, Walbro 340, Acufab FP reg, 50# MSD inj, Iceman UCA/LCA's, Scanmaster, trans +, Hooker 2.5" duals, BH TH200-4R, WCC 3000 Stall LO.
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July 3rd, 2008, 03:26 AM
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even new parts have atendency to fail,especialy these days with the shoddy workmanship going into products these days.could be coils but my guess is the mod,if you know someone w/a spare or even on thier car easy swap to see if prob, is either one of them imo
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July 3rd, 2008, 02:05 PM
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Happened to me in rush hour on the I-5
 I had the car towed home and when it got off the flatbed, she started up and pulled into the garage with no issues. (She was probably tired and wanted to ride for a change )I was told to pull the ecu and check and clean the connections as well as the chip. I did so, and changed nothing else and never had that issue again. Just a thought...
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Just some slow TR's that are still faster than "my1stgn".
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July 3rd, 2008, 02:37 PM
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How about the fuel pump? It happened to me, before I realized the car was starving for fuel and got too hot and just down. Replaced the pump with a 340, and it fixed the problem.
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Nick http://community.webshots.com/user/N...host=community 1987 GN T-Top Comp Cam 215/210, Diamond Pistons, 1.65 rollor rockers. h-beam rods,ported heads,atr headers, CPT61BB Turbo. Mods: GBP 3" DP, dutt-neck IC, TT alky chip, Razor's Alky, Walbro 340, Hot wire kit, Acufab FP reg, 60# inj, 100lb. valve springs, stage 2 tranny,translator, LS1, bee hive springs, 3200 Stall, external tranny and oil cooler and 140 AMP.
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July 4th, 2008, 12:22 AM
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Pull your serpentine belt and check your harmonic balancer. If the balancer bolt is loose, the balancer will walk, the crank sensor will loose its signal and cause all kinds of misfiring. I had this problem with my old T type. Took me like 2 weeks to figure it out. The balancer bolt needs to be torqued to like 220 ft lbs.
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-87 GN, stock long block, converter, TA-61, 55lbers, 62mm tb, 15 row stretch, thdp, red's 108 chip, hotwired XP pump, best et-11.11@120.65, best mph-121.75, best 60 ft-1.55 -87 GN street car, iron heads, 206 roller, 200r4, no Tbrake 10.16@135. The caboose of the TSM class  -70 GS 455, needs full rustoration
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July 4th, 2008, 07:37 AM
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Check.
Check Maf, sounds like it took a dump, Or just pull the code and find out exactly what the problem is.
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87 Grand National A few mods and still slow.
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July 7th, 2008, 04:36 PM
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Did it again to me. This time I was watching the fuel pressure as the car was cutting out. I'm tending to believe this is some sort of electrical issue. The fuel pressure was rock solid on 40 psi, and the car died on me. I pulled off the side of the road and tried to start the car. It fired, but wouldn't stay running. This happened twice. Then the starter would just go click, click, click.
I called for a tow and had it towed to a shop here in town. This morning it fired up no problem and ran like a champ. I'm going to order up a coil pack and module today and try and reseat the chip in the ECM.
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Sean Thomas 1986 GN Astroroof Comp Cam 212/218, .463/.471, 110LSA, billet center mains, TRW pistons, stock crank/rods, Ported stock heads/intake, ARP studs throughout, PTE DBB 6262 S cover, RJC pp, GBP 3.5" DP w/3.5" dump pipe, Z06 3.75" MAF, RJC 4" intake, KN filter, dutt-neck IC, TT alky chip, Razor's Alky, Walbro 340, Acufab FP reg, 50# MSD inj, Iceman UCA/LCA's, Scanmaster, trans +, Hooker 2.5" duals, BH TH200-4R, WCC 3000 Stall LO.
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July 7th, 2008, 05:42 PM
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was the 'new' module aftermarket?? Is the new 'new' module you're ordering aftermarket?
 Suggest it not be..... 
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Brian MacKinnon Guntersville, AL 86 T-Type, mostly stock
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July 7th, 2008, 05:52 PM
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It was a NAPA unit. I don't remember who they use. Do you suggest AC Delco for the module/coil?
There are several consistant things here. This has happened at cruise...55-70mph, the car was being driven for an extended period of time, as in 15+ miles, the car started and ran fine after it cooled down. I'm not wondering if I have some sort of heat-soak issue with the starter solinoid, starter wiring, etc. I just installed a 3.5" downpipe, and the new combo is obviously putting out a LOT more HP/TQ then it was before. There is a lot of heat down there next to that starter.
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Sean Thomas 1986 GN Astroroof Comp Cam 212/218, .463/.471, 110LSA, billet center mains, TRW pistons, stock crank/rods, Ported stock heads/intake, ARP studs throughout, PTE DBB 6262 S cover, RJC pp, GBP 3.5" DP w/3.5" dump pipe, Z06 3.75" MAF, RJC 4" intake, KN filter, dutt-neck IC, TT alky chip, Razor's Alky, Walbro 340, Acufab FP reg, 50# MSD inj, Iceman UCA/LCA's, Scanmaster, trans +, Hooker 2.5" duals, BH TH200-4R, WCC 3000 Stall LO.
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July 7th, 2008, 06:02 PM
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Check the ESC module. Same thing happened to one of my cars, would run fine for a while, then sputter pop and die. Would restart a few times, then it got to the point where it would just turn over.
Thankfully I was on my way to BPG @ Salem and Jack Cotton let me borrow some things to try and fix it. Figured it out and made it home alright.
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87 Turbo-T, stock - for now 87 Turbo-T 440rwhp, 491ft-lbs (sold) 87 Turbo-T 324rwhp, 393ft-lbs (stolen) Looking for a white or gunmetal W04 hardtop...
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