Smoke at startup - ZR-1 Net Registry Forums

rossgn49u · 06-20-2018

Considering trading my Duster for this car

https://austin.craigslist.org/cto/d/...577312081.html

Seller mentioned car needed to be driven as it smokes a little on startup. I would hope not rings with only 52k miles. What are the potential issues, if any, I could be looking at with "a little" smoke at startup?

Thanks in advance

Ccmano · 06-20-2018

Smoke at startup is not unusual for a 90. They do not have valve stem seals. Highly unlikely rings are an issue, very rare to see ring issues even at very high miles. Worse case the lower injector housing seals are leaking. A relatively easy fix. As me how I know. Price is a bit high for a 52k mile 90’. Looks very clean, but without a detailed service history I wouldn’t bid over $17k for that car. Good luck.
H

oricale · 06-20-2018

Concur!..very common for 90's[emoji6]

Sent from my SM-G955U using ZR-1 Net Registry mobile app

ZR2 · 06-21-2018

I have recently purchased a 94 for less and think you can get one in the high teens with less mileage, but......I do get it. Just remember . .....you have the money and they want it.

rossgn49u · 06-22-2018

Id say the value of the car Im trading is $17k-$18k. I found where the seller purchased the car for $16.5k at Leake auction this Spring. He has since replaced injectors.

tommy · 06-23-2018

I have the same symptom in my 1990, i was afraid when i saw it first time, but now I know that 1990 do not have valve stem seals and i`m calm

Paul Workman · 06-24-2018

If ever you have the heads of you 90 off for porting, or whatever, Marc Haibeck can retro-cut the grooves needed in the valve guides to accept valve stem seals. It also reduces oil consumption a good bit as well.

Hib Halverson · 06-30-2018

My belief is that smoke on start up, if it's very noticeable and happens regularly, is not normal, even for a '90.

While it is true that all the engines built prior to MY91 lacked exhaust valve stem seals and that contributes to higher oil consumption than with the 91-95 engines which had exhaust valve seals–and that oil use is constant, somewhat more than engines with "unsealed" exhaust guides–but they are unlikely to "smoke bad," unless there is some guide wear or some other mechanical problem.

Sometimes smoke on start up can be due to leaking injectors.

Also, smoke on start up could be coolant smoke and indicative of a head cracked around an exhaust port.

It depends on the type of smoke, white, blue or brown/black, and what it smells like

In any event, with 52,000-mi on the odometer and regular smoke on start up, you're looking at eventual repair cost.

Paul Workman · 06-30-2018

Quote:

Originally Posted by Hib Halverson

My belief is that smoke on start up, if it's very noticeable and happens regularly, is not normal, even for a '90.

While it is true that all the engines built prior to MY91 lacked exhaust valve stem seals and that contributes to higher oil consumption than with the 91-95 engines which had exhaust valve seals–and that oil use is constant, somewhat more than engines with "unsealed" exhaust guides–but they are unlikely to "smoke bad," unless there is some guide wear or some other mechanical problem.

Sometimes smoke on start up can be due to leaking injectors.

Also, smoke on start up could be coolant smoke and indicative of a head cracked around an exhaust port.

It depends on the type of smoke, white, blue or brown/black, and what it smells like

In any event, with 52,000-mi on the odometer and regular smoke on start up, you're looking at eventual repair cost.

Well, other issues not withstanding, the little (blue/oil) smoke issued by my 90 on cold startup disappeared with the installation of exhaust stem seals when added to my heads at approx 50k miles. And, overall consumption was reduced significantly enough to make an unmistakable improvement.

Just sayin...

rossgn49u · 06-30-2018

Thanks Paul. Guy quit communicating, so maybe a blessing in disguise.

06-20-2018	#1
rossgn49u Join Date: Apr 2018 Location: Lone Star State Posts: 99	Smoke at startup Considering trading my Duster for this car https://austin.craigslist.org/cto/d/...577312081.html Seller mentioned car needed to be driven as it smokes a little on startup. I would hope not rings with only 52k miles. What are the potential issues, if any, I could be looking at with "a little" smoke at startup? Thanks in advance __________________ Ross Lone Star State 90 ZR-1 Red/Red (Sold) 94 ZR-1 Blk/Blk (Sold) 91 ZR-1 DRM/Tan (Sold) 90 ZR-1 Red/Red (Sold)

06-20-2018	#2
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Smoke at startup Smoke at startup is not unusual for a 90. They do not have valve stem seals. Highly unlikely rings are an issue, very rare to see ring issues even at very high miles. Worse case the lower injector housing seals are leaking. A relatively easy fix. As me how I know. Price is a bit high for a 52k mile 90’. Looks very clean, but without a detailed service history I wouldn’t bid over $17k for that car. Good luck. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.

06-20-2018	#3
oricale Join Date: Oct 2011 Location: STAFFORD VA, Posts: 576	Re: Smoke at startup Concur!..very common for 90's[emoji6] Sent from my SM-G955U using ZR-1 Net Registry mobile app __________________ [B][I][COLOR=red]1990 ZR1[/COLOR][COLOR=black] [U]#00077 [COLOR=red]RED[/COLOR]/[COLOR=red]RED[/COLOR] (10Y022 PEP CAR) [/U][/COLOR][/I][/B][B][I][COLOR=red]1991 ZR1[/COLOR][COLOR=black] [U]#00517 ("Irene")[COLOR=red]WHITE[/COLOR]/[COLOR=red]RED-SOLD:cry:[/COLOR] [B][/B] [/U][/COLOR][/I][/B][B][I][COLOR=red]1992 ZR1[/COLOR][COLOR=black] [U]#00445("The Revenant")[COLOR=red][COLOR="Black"]BLACK [/COLOR][/COLOR]/[COLOR=red]RED(2016 T.O.D!) [/COLOR] [/U][/COLOR][/I][/B] [B][I][COLOR=red]2009 [COLOR=red]Z06!![COLOR=black]BLK/BLK rare Linen interior[/COLOR] 707HP!![/COLOR] [/COLOR][/I][/B] [B][I][COLOR=red]2006[/COLOR] BLK/BLK Z51 (Just SICK FAST!)SOLD)[/I][/B] [B][I]1996 BLK/BLK LT4 Grnsprt(sold...Twice!)[/I][/B] [B][I]1991 RED/REDL98(Fell off the shipping truck:([/I][/B] [B][I]1980 BLK/RED L82(Sold)[/I][/B] [B][I][B][I]1990[/I][/B] RED/BLK(sold.....In Japan)[/I][/B] [I][COLOR=black][B][I]2006[/I][/B][/COLOR][/I] [COLOR=red]Mustang GT[/COLOR] ([B][I]mach 1[/I][/B])[B](sold)[/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1(sold in Japan)[/I][/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1#2(sold)[/I][/B] [B][I]WAZOO Member...[/I][/B] [url]www.evolution-motorsport.com[/url] facebook/evolutionmotorsportengineering Your Local [url]www.Amsoil.com[/url] dealer/user.. Victory Loves Preparation

06-21-2018	#4
ZR2 Join Date: Jun 2018 Location: Maryland Posts: 53	Re: Smoke at startup I have recently purchased a 94 for less and think you can get one in the high teens with less mileage, but......I do get it. Just remember . .....you have the money and they want it.

06-22-2018	#5
rossgn49u Join Date: Apr 2018 Location: Lone Star State Posts: 99	Re: Smoke at startup Id say the value of the car Im trading is $17k-$18k. I found where the seller purchased the car for $16.5k at Leake auction this Spring. He has since replaced injectors. __________________ Ross Lone Star State 90 ZR-1 Red/Red (Sold) 94 ZR-1 Blk/Blk (Sold) 91 ZR-1 DRM/Tan (Sold) 90 ZR-1 Red/Red (Sold) Last edited by rossgn49u; 06-22-2018 at 07:34 AM.

06-23-2018	#6
tommy Join Date: Feb 2018 Location: Poland Posts: 58	Re: Smoke at startup I have the same symptom in my 1990, i was afraid when i saw it first time, but now I know that 1990 do not have valve stem seals and i`m calm

06-24-2018	#7
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,493	Re: Smoke at startup If ever you have the heads of you 90 off for porting, or whatever, Marc Haibeck can retro-cut the grooves needed in the valve guides to accept valve stem seals. It also reduces oil consumption a good bit as well. __________________ Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry

06-30-2018	#8
Hib Halverson Join Date: Jun 2005 Location: CenCoast California Posts: 899	Re: Smoke at startup My belief is that smoke on start up, if it's very noticeable and happens regularly, is not normal, even for a '90. While it is true that all the engines built prior to MY91 lacked exhaust valve stem seals and that contributes to higher oil consumption than with the 91-95 engines which had exhaust valve seals–and that oil use is constant, somewhat more than engines with "unsealed" exhaust guides–but they are unlikely to "smoke bad," unless there is some guide wear or some other mechanical problem. Sometimes smoke on start up can be due to leaking injectors. Also, smoke on start up could be coolant smoke and indicative of a head cracked around an exhaust port. It depends on the type of smoke, white, blue or brown/black, and what it smells like In any event, with 52,000-mi on the odometer and regular smoke on start up, you're looking at eventual repair cost. __________________ Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878

06-30-2018	#10
rossgn49u Join Date: Apr 2018 Location: Lone Star State Posts: 99	Re: Smoke at startup Thanks Paul. Guy quit communicating, so maybe a blessing in disguise. __________________ Ross Lone Star State 90 ZR-1 Red/Red (Sold) 94 ZR-1 Blk/Blk (Sold) 91 ZR-1 DRM/Tan (Sold) 90 ZR-1 Red/Red (Sold)