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Here. I have an 01 suburban with a 5.3. On a cold start,
on a cold start, probably anywhere below freezing, it won't stay running unless you stay with it and keep your foot on accelerated. As it warms up a bit, 2-5 minutes it runs perfectly. I suspect a leaky intake gasket, so tried spraying starting fluid around intake manifold base, to no avail. i came up with the following 3 codes; P0171- system too lean bank 1; P0300-random/multiple cylinder misfire detected andP0452evap. emission system pressure sensor/switch low. … read more
Tyler Henry
Tyler Henry
Technician
Automotive service technology
294 satisfied customers
My 2002 Tahoe has a rough idle. At cold start. Here's a
Tahoe super rich rough idle for about 1 minute. 2002 Tahoe 5.3 engine, non flex fuel. cable throttle. 165k miles. Cold start about 60 degrees ambient, starts fine to quick high idle as it should but then drops to normal idle, runs very rough for about a minute. Drives fine after that. Yesterday also ran rough on a hot start and stalled. No codes active or pending. Scan tool shows -10% short term fuel trim at idle. Raise RPM to 1000 and fuel trims look closer to zero and loping stops. Scan tool also shows engine temp very close to ambient temp. Had a complete tune up about 5000 miles and one year ago including all 4 oxygen sensors, new MAF, plugs, wires, fuel pump and filter. Also new intake gaskets. Fuel pressure regulator vacuum hose has no gas in it. Removing hose from regulator does not change engine speed and there is vacuum at hose. Any thoughts appreciated. … read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,756 satisfied customers
Chevrolet K1500 4x4: My 1994 Chevy K1500 350 TBI is staggering
My 1994 Chevy K1500 350 TBI is staggering during acceleration, but only after it has heated up, not when cold. Just rebuilt TBI and replaces EGR and EGR solenoid and fuel injectors.… read more
Amedee
Amedee
Automotive Consultant
Vocational, Technical or Trade Scho
19,489 satisfied customers
Chevy Camaro: During the cold start/catalytic warm up
During the cold start/catalytic warm up period I am getting misfires on all cylinders. But only happening during that catalytic warmup. As soon as the warm up is complete, about 10sec, the car enters … read more
ASEMaster35yrs
ASEMaster35yrs
Vocational, Technical or Trade Scho
2,061 satisfied customers
Chevrolet Silverado 1500 Classic LT: silverado 2003 with 5,3l
silverado 2003 with 5,3l one night quitted on the highway towed home...changed fuel pump and filter...and still does the same...checked fuel pressure at rail and ok....No codes...changed crank positio… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
23,904 satisfied customers
Chevrolet Monte Carlo: Fans will not start when engine starts
Fans will not start when engine starts to get hot but both fans will start when the AC is turned on. Could this be caused by one of the three fan relays or the engine coolent sensor or the car's compu… read more
BOBBYSS
BOBBYSS
Automotive Repair/Damage Investigator
Associate Degree
14,565 satisfied customers
2001 Silverado 2wd 4.8, 150k miles..cold start in winter..temps
Hello again, Same truck as before but new problem. 2001 Silverado 2wd 4.8, 150k miles I have no "high idle" during a cold start in winter. When started during cold outside temps, the idle will go up t… read more
15yearsaturnguy
15yearsaturnguy
auto instructor
G.M. world class master tech
1,918 satisfied customers
1999 Chevrolet Tahoe: 5.7L..High Idle..000 rpm..the idle speeds
1999 Chevrolet Tahoe (5.7L) - High Idle in Cold: This is my second attempt with Just Answer. After two years of diagnosis I can still not figure out why my vehilce continually idles at 1,000 rpm when … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
5,398 satisfied customers
2002 chevy: cause a random misfire..trouble codes..p0174 p0171
What would cause a random misfire, system to lean bank 1 and 2? The trouble codes are p0300 p0174 p0171 on a 2002 chevy 5.3… read more
hauto
hauto
Operate own repair shop
Bachelor's Degree
2,719 satisfied customers
2002 Chevy Silverado 1500: cold start..starts right..it runs great
Hello, I have a 2002 Chevy Silverado 1500 that has been idling rough with the service engine light coming on. When I start it from a cold start, it starts right up however after about 30 seconds it be… read more
John
John
Master A.S.E Automotive technician
2 YEARS COLLEGE
4,071 satisfied customers
1989 chevy: very rough cold and warm &..stall..stop light..hesitation
I have a 1989 chevy silverado with a Z motor. 4.3 The engine idles very rough cold and warm & wants to stall when I put it in gear cold, & after warmup. Also, when I go to take off from a stop light o… read more
Ted G.
Ted G.
Sales Manager
Vocational, Technical or Trade Scho
5,478 satisfied customers
2000 chevy impala: car started running with a 1500..ac..temp gauge
i was working on my 2000 chevy impala i had a broken coolant temp sensor..i remove the filter housing just to have more clearance.. i installed the new coolant sensor and the car started running with … read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
29,894 satisfied customers
1995 s10: wheel drive..engine doesnt..210 degrees then drops..stays
1995 s10XXXXX engine doesn't produce heat after stat opens. initially goes to 210 degrees then drops to 170 degrees and stays. heat output registers aroound 110 degrees at air outlet inside. Have had … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,642 satisfied customers
1996 Chevy: v6 engine..truck idles low causing it to stall..Engine oil
I have a 1996 Chevy s-10 w/ v6 engine. My oil pressure is low, normally around 20 at idle and 40 when driving. The truck idles low causing it to stall at stops. the temp is at about 190. Engine oil is… read more
Mike
Mike
High School or GED
417 satisfied customers
i have a 1993 chevy silverado 4.3 with a 5 speed manual its
i have a 1993 chevy silverado 4.3 with a 5 speed manual it's 4x4 anyway the truck has been problems missing at idle and under load it feels like it is loaded up so i replaced the cap, rotor,coil,ignit… read more
Jeremy Phipps
Jeremy Phipps
Lead Technician
Vocational, Technical or Trade Scho
72 satisfied customers
96 chev 6.5 Diesel. Glow plugs cycle, starts great..fuel pump
96 Chev 6.5 Diesel. Glow plugs cycle, starts great when warm. When below 30 degrees, NO glow plugs and No fuel pump power. Same thing happened last winter. Have replaced both temp sensor in coolant cr… read more
Steve
Steve
Vocational, Technical or Trade Scho
204 satisfied customers
2002 Silverado 2500: service engine light..misfires..RPM..highway
2002 Silverado 2500 HD. Showing code P300/service engine light -random misfires, only when the engine is at or exceeds 2600 RPM both in idle and on the highway. Never occurs under 2600 RPM or when the… read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,756 satisfied customers
1999 Cadillac Escalade: Oxygen Sensor..EGR..no check engine light..DTC
Hi I went to NJDMV yesterday to have my 1999 Cadillac Escalade 5.7L 93,000 miles inspected but it failed OBDII for; Catalytic Converters NOT READY Oxygen Sensor-Heaters NOT READY EGR Systems NOT READY… read more
Dave Nova
Dave Nova
Chevrolet Technician
Associate Degree
7,092 satisfied customers
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Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,756 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,642 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,884 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,953 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,836 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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