A friend of mine brought me this 1999 GMC Jimmy stating that they were having trouble starting the truck when it got cold outside. Of course the day they brought it to me it wasn’t cold. Because of that, I had to look for possible causes of the problem. In this video I cover the basics of what I check in a situation like this. I did find something, be sure to watch the video to see what I found. Here’s some useful links for you.
Looking Into The Horses Mouth: http://www.youtube.com/watch?v=NTKNueB8YXo
Forum discussion about this video: https://www.ericthecarguy.com/forum/18-The-EricTheCarGuy-Video-Forum/45925-solving-cold-start-problems-1999-gmc-jimmy#65019
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Problem I have with mine is in addition to hard starting all the time is constant gas smell can't find vacuum leak or fuel leak
Noting solved?
On on on on on on on on
On
I've got the same problem on a n14 pulsar after running on some sort roads. I'm hoping it's just vacuum or maybe plugs as it's past service
Lol, rev and check fuel trims to determine vacuum leak or fuel shortage, lol come on Eric
hey car guy, ive stumbled on this looking for cold start circuit issues on same truck , blown fuse not the case here but seen it a few times on others, ive been rebuilding alternators and starters, since i was 12, with dad of course,nearly 50 years now !
Beed help pkease with my 2001 chevy blazer 4.3 v6 5 speed wont turn on in the morning but whrn it get a little hot it will I already change the carbulator spark plugs sparkplugs wire the ignition switch batterie and still wont turn on in the morning
Got pontiac fiero that does that alot
Someone removed the seal they do have one
I have a 99 GMC Sierra 5.3L and my truck begins to shake when I’m still for more than 3 mins (at a red light stop sign etc) it also shakes in the cold mornings rpms go to 500 I already changed the spark plugs
Thanks for the info my friend. I have a 1995 that stalls immediately after starting normally it just dies! Any ideas? Also if you can recommend a scanner tool for those models the 1.5 obd
Fuel filter
I have a 95 Chevy 3500 with a 454… when I go to start it when the engine is cold, it fires right up but I have to feather the throttle to keep it running, it tries to load up with gas and occasionally will backfire through the exhaust, this happens only for about a minute then it clears up and the truck runs perfect…. it only does this at the initial start when the engine is cold, if it has any engine heat it starts and runs perfect. Any help is appreciated.
Fuel delivery problem .. yes that's it
Fuel pump
Weak spark in my caprice 96
That intake tube directly over the throttle body should have a metal clip that holds itself to the throttle body. That and the plastic wing nut extension holds down the intake tube to throttle
I have the same model, and it was doing the same thing, when it was cold outside,. Nobody could figure it out! Then I thought heck I pull the cap and rotor off. I found the problem!!!!! The was really carbon up and the metal was bent and twisted. (I put the cap & rotor on 6 mo earlier, so I didn't think that would be the problem but it was! The store sold me a piece of junk, made in Japan. I put on a AC-Delco cap and rotor, no more problems! Car can sit a week in freezing and still start with tap of the key!!!!
I know this video is old, but I drive an '02 Blazer and there is supposed to be a metal clip that holds that resonator tight to the front end of the throttle. The clip is missing on this one.
Depending on how cold it is outside, even with all these fixes Eric did, sometimes you just can't get it to start. Even with ether, jumper cables or all those "suggested" starting tricks. But rather than fighting your vehicle or equipment for hours out in the cold, get your engine started in minutes quickly and reliably every time. Check our our new cold weather engine starting system in action. Learn more at http://www.cold-fireinc.com or see a demo https://youtu.be/vDHM11Hca9o. Install it yourself or have a mechanic do it for you, it's just that simple.
Thank you for that explanation. I have a 2000 Jimmy and I have similar problems. I imagine to just go OEM parts for this truck?
terrible designed car
did u ever get that car back?
They didn't fix it . If it starts and runs then just pass it off to some sucker on craigslist . Buyer beware !
Hi Eric, 99 gmc safari van 4.3 v6 has opposite issue. Engine starts perfect when cold but Cranks forever when hot. Eventually it starts and stalls …immediately crank again and it starts and runs ruff for 2 seconds…Then seems to run fine. Fuel pressure tests fine at 60 pounds however it begins to bleed down right away possibly a bad fuel pressure regulator in the Plenum. Spark plugs wires rotor all change with AC Delco new parts makes no difference. Vacuum seems fine as the HVAC controls are vacuum operated and they are working fine. Changed out a bad coolant temperature sensor now the temp Reaches 210 normally. Normally no check engine lights however after the long hot start and stall …I sometimes get a PO302 misfire detected cylinder 2 …sometimes …I get no check engine light all the pens how hard the stall is. I’m leaning towards a leaky fuel pressure Regulator located inside the intake Plenum but I’m not sure why it starts perfectly fine when the engine Has been sitting for 8+ hours. I hate to take the whole intake Plenum apart as it’s a big job to change out a $20 part. All fluid levels are perfect. Ignition coil in regulator have been changed out , no difference.
Any thoughts or suggestions?
16:27 duh. Vac leak = harder to cold start.
Don't use water to find vac leaks. Propane if a DIYer or a smoke machine if you have a fancy shop like yours.
Ask Someone Else
Use PROPANE GAS to find leaks! That water is terrible for everything in that engine. Water doesn't compress, and corrodes electrical connections, ESPECIALLY when energized. I'd be pissed if a "pro" squirted water all over my engine bay
3:41 condensation on the oil fill cap says coolant is leaking into the crankcase. There's that.
New battery, new gas cap, gas, oil, 50/50 fluid, cold outside and raining. What else could be wrong? Thanks