why wont my 4.3 rev past 3000 rpm

Asked by Mar 26, 2013 at 02:02 PM about the 2003 Chevrolet S-10 3 Dr LS 4WD Extended Cab SB

Question type: Maintenance & Repair

my 4.3 idles good but wont rev over 3000 rpm. it has new tuneup, fuel filter

10 Answers


Here's a long shot. It might not know that it's in gear. Modern engines can only rev to 3000-4000 in neutral or park so they don't blow up. I don't know how to check it or fix it but get the codes read to see if anything turns up.

3 of 3 people found this helpful.

Roy bean have you been hitting the bottle again. Egr and PCV won't prevent engine rpms from increasing. Its either as Tenspeed said, computer controlled rev limiter or a common one is a clogged exhaust, the most common under that category is backed into a curb and bent something or clogged cat. Inspect exhaust and if nothing looks bad then pull the front most O2 sensors and run it to look for improvements. Lack of air flow, and lack of fuel pressure are usually the cluprits.

2 of 2 people found this helpful.

Clogged cat or exhaust. Tps maybe but idk on a 4.3. Explain to me how the pcv system will stop the engine from reving. Open egr would cause bad idle, closed egr will run good no matter what.

4 of 4 people found this helpful.

Egr and PCV recirculate an unbelievably small amount of unburnt hydrocarbons and the only time it will affect anything is at an idle when it's stuck open. It will NOT limit an engine to 3000 rpm and it will NOT cause the computer to become confused for any reason. A clogged catalytic converter or clogged exhaust, usually from being bent will limit the engines rpm because it can't "exhale". Exhausts get bent on a daily basis by people backing into curbs and a 10 year old catalytic converter is right at the common fail age. A rev limiter thinking the car is in neutral or park is also a likely hood and it wouldn't be the first time it was what caused this issue for someone on this site. Being from lake county Indiana we had the same emissions as California and I'm telling you the issue isn't a PCV valve or and egr valve. Btw its a post 2000 GM so the egr is elecrltronic not vacuum operated, and his issue is the vehicle won't to past 3000 rpm, NOT it's decelerating funny. Read the issue before you pull an answer out of that hat.

4 of 4 people found this helpful.

Here's a good question,"Why would you want to rev your engine over 3000 rpm in park"?

2 of 2 people found this helpful.

Its an 03 the distributor is electronic not vacuum or centrifugal. GM went to electronic distributors in the late 80's

1 of 1 people found this helpful.

Since it's obd 2 issues with the ignition would trip the light.

Timing belt has jumped a tooth~

5 of 5 people found this helpful.

Gear driven not belt and it would run horribly at all times if this happened due to how small both gears are, it would put the valve timing about 30 degrees out~

2 of 2 people found this helpful.

2002 Chevy Venture Extended Mini Van, makes awful noise as it takes off. With engine noise, I can drive at 50MPH. Checked in neutral and engine is smooth but noisy. Maximum RPM is limited as speed drops, RPM just cycles. It sounds like exhaust is blocked. Exhaust system was replaced, but not catalytic converter. Could it be a melt down converter, and blocking exhaust? Will MAP indicate excessive exhaust back pressure? Need help!

Your Answer


Looking for a Used S-10 in your area?

CarGurus has 1,221 nationwide S-10 listings starting at $1,550.


Chevrolet S-10 Experts

  • #1
    Andrew Olsen
  • #2
    John Saffrahn
  • #3
View All

Related Models For Sale

Used Ford Ranger
186 Great Deals out of 5,550 listings starting at $999
Used Chevrolet Colorado
361 Great Deals out of 38,161 listings starting at $1,595
Used Chevrolet Silverado 1500
2,666 Great Deals out of 174,502 listings starting at $955
Used Toyota Tacoma
708 Great Deals out of 45,625 listings starting at $1,000
Used GMC Sonoma
5 Great Deals out of 423 listings starting at $2,150
Used Ford F-150
3,271 Great Deals out of 221,644 listings starting at $1,200
Used Dodge Dakota
82 Great Deals out of 3,630 listings starting at $1,295
Used Chevrolet Blazer
6 Great Deals out of 945 listings starting at $950
Used Nissan Frontier
482 Great Deals out of 23,929 listings starting at $1,800
Used GMC Canyon
152 Great Deals out of 13,781 listings starting at $1,500
Used GMC Sierra 1500
1,189 Great Deals out of 64,581 listings starting at $999
Used Dodge Ram 1500
430 Great Deals out of 11,127 listings starting at $1,495
Used Chevrolet Camaro
456 Great Deals out of 31,607 listings starting at $1,450
Used Ford Mustang
591 Great Deals out of 39,477 listings starting at $1,895

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.