I recently purchased a 1999 Chevy 1500 gas Z71 with 4 wheel drive. It has the 5.3 V8 engine and automatic transmission. It usually runs great but when I'm going over about 50 MPH and need to pass someone the truck jerks (similar to trying to put a manual transmission in fourth gear when it should be in third or second gear). If I push the gas pedal all the way down it doesn't seem as bad. Is this a fuel problem or transmission problem? The truck accelerates good from start up to desired speed.
- Thread starter Jrry
- Start date
Allan in NE
Well-known Member
A repetitive jerking condition usually points at secondary ignition, a "bog" type abnormality hints at fuel or MAF.
Doubt if there is anything wrong with the transmission.
Allan
Doubt if there is anything wrong with the transmission.
Allan
Anonymous-0
Well-known Member
Watch your RPM the next time it jerks, normally, in overdrive and up to <>75 m.p.h. you should run around 2100 rpm. If the rpm jumps up around 3000 when you accelerate to pass then overdrive may not be pauseing. Also check it on cruise control going up a hill. Could be minor electrical problem or former owner may have routinely pulled heavy loads in overdrive.
You should install a pressure gauge to see what the fuel pressure is and if its dropping when on a steep hill. They had some problems with those tank fuel pumps. Hal
PS: I had a Chevy Citation with the 2.5 L engine
with TBI that was cutting out. Pulled the tank found rust and dirt around the sack on the inlet pipe. I replaced the pump while I had the tank off and cleaned the tank. No problems after that.
I had installed a gauge and the pressure would drop on a steep hill.
PS: I had a Chevy Citation with the 2.5 L engine
with TBI that was cutting out. Pulled the tank found rust and dirt around the sack on the inlet pipe. I replaced the pump while I had the tank off and cleaned the tank. No problems after that.
I had installed a gauge and the pressure would drop on a steep hill.
Sounds like you are "lugging" that engine a little, by using just a little throttle, and it isn't shifting out of overdrive. This is normal, but the jerking isn't.
I agree with Allan, that you have a "miss" in there, under load, that is probably ignition oriented. Try a little higher octane fuel for a tank. This would help pinpoint the problem if your jerking is less. How long since you replaced plugs and plug wires?
Gordo
I agree with Allan, that you have a "miss" in there, under load, that is probably ignition oriented. Try a little higher octane fuel for a tank. This would help pinpoint the problem if your jerking is less. How long since you replaced plugs and plug wires?
Gordo
Anonymous-0
Well-known Member
Or ,,if it 's slow in the shop . Sell em a Injector service , upper intake ,throttle body service . Trans service, power steering sevice . Alignment , and new wipers ? lmao !!!
Really though,I'd throw a fuel filter on there<if for maintinance if nothing else> Possibly plugs AND wires . If still doing it , check fuel pressure on road test . Betting you have a plug or wire breaking down though .
Really though,I'd throw a fuel filter on there<if for maintinance if nothing else> Possibly plugs AND wires . If still doing it , check fuel pressure on road test . Betting you have a plug or wire breaking down though .
Goose
Well-known Member
Don't overlook the simple and obvious.
I had the same thing happen on both a Chevy pickup and a Ford Aerostar van. In both instances the problem was a plug wire somehow becoming detached from the spark plug. Probably weren't snapped on properly in the first place and worked themselves loose.
I babied the Aerostar 1200 miles home from Washington DC that way because I didn't want to tear into it on the road. And that's all it was.
I had the same thing happen on both a Chevy pickup and a Ford Aerostar van. In both instances the problem was a plug wire somehow becoming detached from the spark plug. Probably weren't snapped on properly in the first place and worked themselves loose.
I babied the Aerostar 1200 miles home from Washington DC that way because I didn't want to tear into it on the road. And that's all it was.
Brokenwrench
Member
I agree with Allan. More than likely an ignition problem, not trans or fuel.
I`d start with plugs and plug wires. They are the most likely culprits, and a good maintanance idea anyway.
Be sure to replace the wires, not just the plugs. Most load misses are found in the wires. If you don`t use the GM wires make sure and get a premium grade from the parts store..
I`d start with plugs and plug wires. They are the most likely culprits, and a good maintanance idea anyway.
Be sure to replace the wires, not just the plugs. Most load misses are found in the wires. If you don`t use the GM wires make sure and get a premium grade from the parts store..
Only you can tell if the "jerk" is from lack of engine power - or you're in too high a gear. If you think it's acting like a standard shift would when downshifting is needed - perhaps your torque-converter isn't unlocking like it should? When you hit the gas pedal to pass someone, it's supposed to unlock. If your truck is geared high, and your in 4th -locked - and it stays that way when you hit the gas - it's going to lug. I've got a 1/2 ton diesel with 3.08 axles and it will jerk at 50 MPH if the converter is locked and I stomp on the gas pedal.
Old Ford Mechanic
Well-known Member
Had one doing that awhile back.Beleive it or not but,a new fuel filter solved the problem.
dave guest
Well-known Member
Agree with Gordo. Had Ford 150 would do that if not premium gas. Maybe knock sensor was retarding timing. Only thing I could think of. Doesn't retarded timing reduce vacuum. Then kickdown might be delayed. That's what it seemed like to me. 1991.
charles todd
Well-known Member
We had a 2000 Chevy Malibu that would do that occasoinally at a steady cruise (cruise control on or off). Replaced several parts and it would keep comming back. It only had 107,000 miles on it. Also coolant would mysteriously disappear at a rate of filling the overflow reservoir about once a month.
We sold the car... And bought this
2008 MINI COOPER S
This jewel will give a Mustang GT a run for its money and get 35+ mpg doing it!
Charles
We sold the car... And bought this
2008 MINI COOPER S
This jewel will give a Mustang GT a run for its money and get 35+ mpg doing it!
Charles
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