help with stalling
Thread Starter
Drifting
Joined: Jun 2005
Posts: 1,426
Likes: 1
From: brookville pa.
help with stalling
ok guys have 1990 L98, i did the lt1 intake swap everything is hooked back up and having prob. with car stalling when you first start it open loop. seems when it warms up closed loop idles fine no stalling at a 1000 rpm little high but that is where it has always idled, any ideas as to why. i checked for vac leak with starting fluid and can not seem to find any, help is appr. geo. ps could timing effect this prob. car might not be timed to where i would like it around 8/10 instead of 6 
car is in garage now because of winter, could it be that it just needs to be run so ecu can learn again
car is in garage now because of winter, could it be that it just needs to be run so ecu can learn again
Last edited by geogolf; Dec 20, 2007 at 10:33 AM.
Safety Car
Joined: Jan 2006
Posts: 3,566
Likes: 4
From: Mt Laurel NJ
St. Jude Donor '06-'07
George,
You have the Coolant Temp Sensor in the remote thermostat housing, correct? make sure it is working properly, if you have a scanner, see what it is reading, and check your fuel pressure. Did you use a different distributor when you installed the new intake?
If you don't have a scanner, take the car to Auto Zone, and ask them to scan it.
Good luck
You have the Coolant Temp Sensor in the remote thermostat housing, correct? make sure it is working properly, if you have a scanner, see what it is reading, and check your fuel pressure. Did you use a different distributor when you installed the new intake?
If you don't have a scanner, take the car to Auto Zone, and ask them to scan it.
Good luck
Thread Starter
Drifting
Joined: Jun 2005
Posts: 1,426
Likes: 1
From: brookville pa.
stalling
randy i do have remote therm. housing i was kinda thinking about that also but it seems to be ok, but i have another sensor and can change it out to check. i did use the stock distb. fuel pres. is ok the way it dies is first start runs ok for 30/45 seconds then it will start to die and catch itself, a couple of those and it finally stalls, seems once it goes to closed loop everything is ok, i have a laptop and tunerpro rt so i can do some checking but might just wait till spring so i can get car out and run it some. thanks for help geo.
Last edited by geogolf; Dec 20, 2007 at 11:02 AM.
Thread Starter
Drifting
Joined: Jun 2005
Posts: 1,426
Likes: 1
From: brookville pa.
teflon
rick or randy would permatex be ok to use, or might have to use a bigger wrench: will reinstall sensor without teflon and post results, thanks geo.
Last edited by geogolf; Dec 20, 2007 at 11:22 AM.
Thread Starter
Drifting
Joined: Jun 2005
Posts: 1,426
Likes: 1
From: brookville pa.
stalling
rick /randy put new cts in no difference, fuel pres. is 41# still stalls when cold. and when it warms up i notice the rpm will go from 1000 to 7/8 hund. and then will go back to 1k seems like that is prob. when it warms up, no stalling just rpm down/up etc. any ideas, would timing cause that
Melting Slicks
Joined: Nov 2004
Posts: 2,799
Likes: 2
From: Cape Coral FL
little late but... use a smidge of liquid Teflon sealer with ECT sensors on the first couple of threads...enough to seal, but not interfere with grounding. DO NOT use Teflon tape.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Thread Starter
Drifting
Joined: Jun 2005
Posts: 1,426
Likes: 1
From: brookville pa.
stalling
hey racer have any ideas about rpm up and down when warm, does not stall when warm just up and down rpm. i did the starting fluid drill and can not get motor to race at all
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 32
From: The Top of Utah
The timing is not the cause of the stalling/idling problems. You seem to be past it, but Teflon tape can insulate the threads and reduce current flow or prevent grounding. A pipe dope, Teflon paste e.g. will seal without insulating. Is the cam mild or stock? I assume the stock 1990 ECM and chip? The symptoms point toward a lean mixture which is most probably a vacuum leak.
RACE ON!!!
RACE ON!!!
Safety Car
Joined: Jan 2006
Posts: 3,566
Likes: 4
From: Mt Laurel NJ
St. Jude Donor '06-'07
The timing is not the cause of the stalling/idling problems. You seem to be past it, but Teflon tape can insulate the threads and reduce current flow or prevent grounding. A pipe dope, Teflon paste e.g. will seal without insulating. Is the cam mild or stock? I assume the stock 1990 ECM and chip? The symptoms point toward a lean mixture which is most probably a vacuum leak.
RACE ON!!!
RACE ON!!!
Good luck
BTW, how does she run w/ the new intake?
Thread Starter
Drifting
Joined: Jun 2005
Posts: 1,426
Likes: 1
From: brookville pa.
stalling
will check brake booster again, sprayed sf every where i could think of and no revs but i wll put a couple hose clamps on brake b and see. i have not been able to get car out and run it but i sure like the way it revs now
ps chip was redone by jesse for the bigger injs.
ps chip was redone by jesse for the bigger injs.
Team Owner
Joined: Jul 2004
Posts: 28,330
Likes: 3,245
From: Hartford WI
Thread Starter
Drifting
Joined: Jun 2005
Posts: 1,426
Likes: 1
From: brookville pa.
update on stalling
ok did the iac setup, and did help the surging up/down prob. but it just seems that this car will not idle any lower that 1000/1100 rpm and not stall out when you put it in gear. i set the min. idle at 7/8 hundred with car in drive hooked back up iac/timing wire and it idles perfect at 900 but when you put in in gear stalls out so when i set it at 1000/1100 and put it in gear idles around 8/9, i guess that the way it is 12/23/07 
but i can live with that little prob. thanks for everyones help merry xmas geo
but i can live with that little prob. thanks for everyones help merry xmas geo
Team Owner
Joined: Jul 2004
Posts: 28,330
Likes: 3,245
From: Hartford WI
Well, it is speed density and you might have to change your EPROM programming to get it to work properly. I had that same issue when I did the Superram setup. Lingenfelter fixed it for me./
Thread Starter
Drifting
Joined: Jun 2005
Posts: 1,426
Likes: 1
From: brookville pa.
stalling
i did have jesse azzato redue chip for bigger injs. and he just redone it for a prob. with car running rich ,solved that prob.when spring hits again will do some datalogging, and may find a cure thanks for all the help geo.
Team Owner
Joined: Jul 2004
Posts: 28,330
Likes: 3,245
From: Hartford WI
You will need datalogging to fine tune it, I think.