03 impala bucking wildly after repairs

Asked by Sep 04, 2017 at 12:05 AM about the 2003 Chevrolet Impala

Question type: Maintenance & Repair

03 Impala, 3.8L engine.
Problems started with systematic cooling system failure. (Classic coolant
elbow failure) car driven with constant coolant loss and replacement, and
water fills.
Radiator cracked at upper hose. Family put pepper in system per mechanic
advice to attempt to slow leaks until repair could be afforded/time to work on.
Thermostat failed.
I started digging.
Pulled radiator, replaced.
New upper radiator hose (we happened to have one)
New thermostat
New water pump (also happened to have)
New lower intake manifold (old one pitted and failing)
New lower intake gaskets
New coolant elbows
Cleaned all surfaces for elbows and gaskets for proper seal.
Upper intake (plenum) appears ok, gaskets in good shape (replaced plenum
and gaskets last year)
Had to remove power steering pump to replace water pump, 2 bolts out, 2
bolts in. Tightened
Alternator removed and reinstalled during process of getting to intake
New O-rings on fuel injectors, since they were out.
Everything installed, tightened, double checked, all wiring re-installed and
Serpentine belt verified routed correctly. Coolant dumped into radiator.
Start engine, and it will "run" for a very short time, but engine bucks wildly,
serpentine belt bounces highly abnormally, all pulleys seem secure, no play I
can see. Chirping sound from pulley side, not sure which pulley. But then the
engine violently quits. Can still turn over and start, but something is very much
not right. And I don't know where to start.

No answers yet

Your Answer

Chevrolet Impala Experts

  • #1
  • #2
    Tom Demyan
  • #3
    Danny Wang
View All

Related Models For Sale

Used Chevrolet Malibu
100 Great Deals out of 2,046 listings starting at $1,485
Used Chevrolet Camaro
3 Great Deals out of 838 listings starting at $12,907
Used Honda Accord
80 Great Deals out of 910 listings starting at $1,411
Used Nissan Maxima
35 Great Deals out of 377 listings starting at $2,450
Used Toyota Camry
94 Great Deals out of 2,281 listings starting at $1,781
Used Ford Mustang
10 Great Deals out of 1,033 listings starting at $3,500
Used Chevrolet Silverado 1500
182 Great Deals out of 10,637 listings starting at $399
Used Chevrolet Tahoe
4 Great Deals out of 739 listings starting at $6,935
Used Nissan Altima
89 Great Deals out of 1,414 listings starting at $1,785
Used Ford Taurus
20 Great Deals out of 315 listings starting at $2,100

Used Cars For Sale

2018 Chevrolet Impala For Sale
213 listings starting at $32,870
2017 Chevrolet Impala For Sale
106 Great Deals out of 274 listings starting at $20,945
2016 Chevrolet Impala For Sale
4 Great Deals out of 55 listings starting at $20,988
2015 Chevrolet Impala For Sale
40 listings starting at $13,842
2014 Chevrolet Impala For Sale
3 Great Deals out of 57 listings starting at $9,977

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.