thermostat question

[87swb]

when i first start my truck when the engine is cold i accelerate and the engine boggles down but when the engine warms up it wont boggle down anymore or not as bad and i have a 160 degree thermostat now and the truck runs about 110 degrees now and about 130 or 140 in the summer. could it be boggling down because of the thermostat or something else. the motor is timed at 15 degrees if that matters.

[roundedline]

How cold does it get where you are?  Is the truck "warmed up" by the time you start driving it?

Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project

[87swb]

i live in tipton county, TN which is in west TN and yesterday it was in the low 30s high 20's. but the truck isn't warmed up to operating temperture when i start driving it but after i crank it i usually let it sit for about 3 to 5 minutes.

[Leadfoot]

Is it a stock elec. choke quadrajet?? If so thats normal ,keeps ya from screamin a cold motor..

Tim

Edited by: Leadfoot at: 12/6/05 6:40 pm

[Lt.Del]

How about the choke?  Is it manual or electric. You didn't give any info on the type of truck...year, model, engine?  

SgtDel

www.delbridge.net

[87swb]

ah yeah you're right, sorry about that. it is a 1987 Chevrolet Silverado R-10 2WD SWB. it has a TBI(fuel-injected) 305 that is bored 0.060 over with headers. it has a Turbo 400 tranny with a 10 bolt rear-end to top it off.

[ChevyGuy]

I would find out what operating temp your year model motor runs the best and buy the right thermostat. Every motor runs at a certain temp the best and if its not at that temp it wont run like it should. Example is my 76 the motor in it is 180 operating temp compared to my 2003 chevy truck I drive at work runs about 210.

[roundedline]

For an 87, I think you have one that is too cold.  I would suggest a 180.

Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project

[87swb]

the one i had in it said 195 but only ran about 160 or 170 in the summer. i guess i'll get another one and try it. thanks everybody i'll keep ya updated.

[roundedline]

The temp number isn't what the temperature will be, it is the temp that it opens.  ECM vehicles run hotter because it lowers emmissions.

I am in no way saying the thermostat is what is causing all of the problems.

Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project

[87swb]

well it may not help nothing but it won't hurt nothing either and there only about $3.99 at Auto-Zone so i'll try it. you don't think it could be be the timing because it is timed at 15 degrees and it is suppost to be at 10 degrees. a mechanic timed it at 10 but it wouldn't stay because he said the timing chain had slack in it, so....i don't know.

[87swb]

well i sort of have an update. i tested the computer with one of those keys you get at auto zone and a code 32 flashed which is a problem with the EGR valve. anybody think this could be part of the problem?

[VileZambonie]

1st your t-stat should be a 195° Running a colder tstat will not do anything accept lower your thermal efficiency and waste fuel economy.

2nd your ignition timing should be set at 0° with EST in bypass mode.

As far as your DTC 32 that really doesn't sound like your driveability problem.

Start with the basics and check all of your ignition components and finally check your fuel pressure. Bogging is usually lack of fuel pressure or an exhaust restriction.

Good luck

[87swb]

so you don't think the EGR has anything to do with it??? what is EST in bypass mode?
and how does a lower thermostat hurt gas mileage?

[87swb]

i took my EGR valve off and cleaned it today and i changed my thermostat to a 195. unfortunately neither have helped. can anyone else suggest anything?