88gmctruck
02GMCtruck
Problem: Welp, you read it right. My headache of a truck has once again decided to not cooperate.
Tabs are due this month, and since moving back to western Wa. it requires an emissions test. Drove it down this morning and it failed the opacity. Limit is 40%, truck produced 77%.
Demographics:
- Year: 1999
- Truck model and class: K2500, 8,600 GVWR
- Automatic or Standard: NV-4500
- Mileage: ~158,### miles
- Replaced parts and mods (IP, PMD, chip/PCM, TM, injectors etc): ATT, Black Stanadyne PMD with #9 resistor. PMD is bolted to a 1/4" aluminum plate with a pentium 4 heatsink and fan mounted behind the driver's battery.
- Model: Turbo-charged L65 "F"
- Ambient outside temp: ~50F
- What fuel are you using? #2 Diesel
- What fuel additives are you using? 50% Silver power service 50% 2-cycle oil mix
- Where are you located?: Covington, WA
General Maintenance:
- Air filter: Wix filter changed on 03/14/2011 @ 148,000 miles
- Fuel filter: Wix changed changed on 03/14/2011 @ 148,000 miles
- CDR Valve?: Cleaned and inspected 02/1/2012 @ 158,### miles
- Coolant – last flushed/replaced at: 6/11/11 with synthetic 3M Coolant.
- Oil – synthetic/regular, Last change: Shell Rotella T 15w40 Conventional & Donaldson Filter, changed Dec 2011 @ 156,000 miles.
- Batteries – state of charge, (matched set) replaced at: Charged, matched Costoc 1,000/800 CA/CCA, New Dec 2011
- Battery cables and grounds (removed, cleaned and tightened): OEM, cleaned and tightened.
- Glow Plugs - how many miles on them?: Unknown What type? Delco G60. Individually tested & working
- Injectors - last changed at: Unknown
History:
- What were you doing when it happened?: Failed Emissions 2/11/12
- How was the truck running fine before this problem appeared?: Still running.
- Has this problem ever happened before?: No.
- Describe any related factors that might be part of the problem: Who knows.
- Have you checked for DTC (Diagnostic Trouble Codes)?: No, the light is not on.
Diagnostics:
1] Starting:
1a] Does the engine start?: Yes.
1b] Does the engine crank over?: Yes.
1c] Are your batteries fully charged?: Yes.
1d] Have you removed, cleaned, and tightened all battery connections?: Yes.
1e] Does your Wait to Start light come on for a time?: Yes. How long?: 10 seconds depending on temp of truck.
1f] Does your glow plug light come on?: n/a For how long?: n/a
1g] Do you see smoke from the exhaust while cranking?: Right after startup, yes. What color?: Normal exhaust colored, lightly sooty, smells like burnt #2.
1h] Does the Service Engine Light Glow during Start/bulb check?: yes.
5] Running Issues
5a] On cold start, does upper rad hose get hard before engine warms up?: After 8-10 mins of running on high idle, yes. Takes longer at normal idle..
5b] Any bubbles or oil film in coolant overflow tank?: No.
5c] Any white slime on oil surfaces (dipstick, CDR, oil Fill cap)?: No.
5d] Excessive white smoke from exhaust on cold start? When it's under ~32F there is white smoke on startup, appears as if it is normal condensation.
5e] Excessive black smoke from exhaust under hard acceleration? No.
6] Performance Issues
6a] Do you have gauges (boost, EGT)?: No.
6b] Maximum boost under load?: Unknown.
6c] Have you added a performance PCM (reflash) or Chip?: No.
6d] Have you changed exhaust / downpipe / crossover?: 3" Straight pipe.
6e] Wastegate – mechanical or vacuum (OEM)?: OEM
List and describe any other factors which are not addressed in this checklist. We can’t see, hear, smell, or touch your truck, so the more descriptive information you can give, the more likely it is that somebody can assist you:
As I stated, it failed it's smog test. The truck was purchased and prior to my move registered in a portion of the state not requiring emissions testing. Now it does. Talked with two emissions shops, the said they check the filters, exhaust, and DTC to start with, all of which are in good shape and filters have 10k or so on them. Truck has no EGR or Cat from the factory. Soot trap is no longer in the exhaust system. Truck is running great.
The test the station performs is a throttle snap test. with the truck stationary, you have to roll the throttle from off to floored, wait 10 seconds, then repeat two more times (3 snaps). The test is repeated 3 more times with the sensor in the exhaust pipe. First thing, the snap test will NOT successfully complete without revving the truck to the governor (which i ****ing hated and told him i'm not comfortable revving my truck to almost 4k). He made me do it anyway. During the test, their computer had difficulty reading my throttle and I had to repeat the test 8 times. Some of the tests wanted me to hold the throttle to the floor for 5-10 seconds, which I wouldn't do.
One shop suggested that the test is making me over-rev my truck, and causing extra smoke. I believe this to be accurate.
Both shops believe the larger turbo (ATT) would have no effect on the results. One shop suggested doing injectors. It was also suggested to not run any additives and switch to bio-diesel for a few tanks before the next re-test.
I was considering putting a #1 resistor in the PMD during the next test.
Any other ideas?
Tabs are due this month, and since moving back to western Wa. it requires an emissions test. Drove it down this morning and it failed the opacity. Limit is 40%, truck produced 77%.
Demographics:
- Year: 1999
- Truck model and class: K2500, 8,600 GVWR
- Automatic or Standard: NV-4500
- Mileage: ~158,### miles
- Replaced parts and mods (IP, PMD, chip/PCM, TM, injectors etc): ATT, Black Stanadyne PMD with #9 resistor. PMD is bolted to a 1/4" aluminum plate with a pentium 4 heatsink and fan mounted behind the driver's battery.
- Model: Turbo-charged L65 "F"
- Ambient outside temp: ~50F
- What fuel are you using? #2 Diesel
- What fuel additives are you using? 50% Silver power service 50% 2-cycle oil mix
- Where are you located?: Covington, WA
General Maintenance:
- Air filter: Wix filter changed on 03/14/2011 @ 148,000 miles
- Fuel filter: Wix changed changed on 03/14/2011 @ 148,000 miles
- CDR Valve?: Cleaned and inspected 02/1/2012 @ 158,### miles
- Coolant – last flushed/replaced at: 6/11/11 with synthetic 3M Coolant.
- Oil – synthetic/regular, Last change: Shell Rotella T 15w40 Conventional & Donaldson Filter, changed Dec 2011 @ 156,000 miles.
- Batteries – state of charge, (matched set) replaced at: Charged, matched Costoc 1,000/800 CA/CCA, New Dec 2011
- Battery cables and grounds (removed, cleaned and tightened): OEM, cleaned and tightened.
- Glow Plugs - how many miles on them?: Unknown What type? Delco G60. Individually tested & working
- Injectors - last changed at: Unknown
History:
- What were you doing when it happened?: Failed Emissions 2/11/12
- How was the truck running fine before this problem appeared?: Still running.
- Has this problem ever happened before?: No.
- Describe any related factors that might be part of the problem: Who knows.
- Have you checked for DTC (Diagnostic Trouble Codes)?: No, the light is not on.
Diagnostics:
1] Starting:
1a] Does the engine start?: Yes.
1b] Does the engine crank over?: Yes.
1c] Are your batteries fully charged?: Yes.
1d] Have you removed, cleaned, and tightened all battery connections?: Yes.
1e] Does your Wait to Start light come on for a time?: Yes. How long?: 10 seconds depending on temp of truck.
1f] Does your glow plug light come on?: n/a For how long?: n/a
1g] Do you see smoke from the exhaust while cranking?: Right after startup, yes. What color?: Normal exhaust colored, lightly sooty, smells like burnt #2.
1h] Does the Service Engine Light Glow during Start/bulb check?: yes.
5] Running Issues
5a] On cold start, does upper rad hose get hard before engine warms up?: After 8-10 mins of running on high idle, yes. Takes longer at normal idle..
5b] Any bubbles or oil film in coolant overflow tank?: No.
5c] Any white slime on oil surfaces (dipstick, CDR, oil Fill cap)?: No.
5d] Excessive white smoke from exhaust on cold start? When it's under ~32F there is white smoke on startup, appears as if it is normal condensation.
5e] Excessive black smoke from exhaust under hard acceleration? No.
6] Performance Issues
6a] Do you have gauges (boost, EGT)?: No.
6b] Maximum boost under load?: Unknown.
6c] Have you added a performance PCM (reflash) or Chip?: No.
6d] Have you changed exhaust / downpipe / crossover?: 3" Straight pipe.
6e] Wastegate – mechanical or vacuum (OEM)?: OEM
List and describe any other factors which are not addressed in this checklist. We can’t see, hear, smell, or touch your truck, so the more descriptive information you can give, the more likely it is that somebody can assist you:
As I stated, it failed it's smog test. The truck was purchased and prior to my move registered in a portion of the state not requiring emissions testing. Now it does. Talked with two emissions shops, the said they check the filters, exhaust, and DTC to start with, all of which are in good shape and filters have 10k or so on them. Truck has no EGR or Cat from the factory. Soot trap is no longer in the exhaust system. Truck is running great.
The test the station performs is a throttle snap test. with the truck stationary, you have to roll the throttle from off to floored, wait 10 seconds, then repeat two more times (3 snaps). The test is repeated 3 more times with the sensor in the exhaust pipe. First thing, the snap test will NOT successfully complete without revving the truck to the governor (which i ****ing hated and told him i'm not comfortable revving my truck to almost 4k). He made me do it anyway. During the test, their computer had difficulty reading my throttle and I had to repeat the test 8 times. Some of the tests wanted me to hold the throttle to the floor for 5-10 seconds, which I wouldn't do.
One shop suggested that the test is making me over-rev my truck, and causing extra smoke. I believe this to be accurate.
Both shops believe the larger turbo (ATT) would have no effect on the results. One shop suggested doing injectors. It was also suggested to not run any additives and switch to bio-diesel for a few tanks before the next re-test.
I was considering putting a #1 resistor in the PMD during the next test.
Any other ideas?
.