93 chevy s10 blazer runs crappy. 4.3 vortec

1993 CHEVROLET TRUCK
Avatar
SMOKINFLOYD4.3
  • MEMBER
  • 56 POSTS
i got this truck for 100 bucks, great condition, the guy said the motor was locked up, i took it home, it wasnt, a batt. cable was loose, it ran rough, the heads were blown, i fixed that, it ran fine for 2 weeks, then the check engine light would come on, it idled rough, ran rich, stalled out, wouldnt start, i ran dionogstics on it, a map sensor code, iac code and a tps code, i replaced those and the o2 sensor and the plugs, the touble codes are clear , but it still runs poorly, i ran a compression check, all 6 cylinders are within specs, there is no water in the oil or vice versa, can anyone know how these vortecs, work??, thanks :x
Jan 3, 2006 at 4:18 AM

What to check next

Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.

Have fuel pressure and delivery checked against the specification for the installed system. Supply the previous repair and compression-test records; assess the separate front-axle engagement complaint separately.

Guidance references and applicability

Source: This question and its visible discussion. The roadmap distinguishes the original owner's reports from other participants' experiences; proposed follow-up is editorial guidance, not a confirmed diagnosis. HELLA: Injection-valve diagnosis https://www.hella.com/techworld/en/technical/sensors-and-actuators/injection-nozzle/ General pressure-test background; use the installed fuel system specifications.

Read the replies · Discussion summary and reported outcome

AI-ASSISTED GUIDANCE · REVIEWED BY 2CARPROS
Advertisement
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,561 POSTS
Dosnt the car have fuel pressure? :D
Jan 4, 2006 at 2:20 AM
Avatar
SMOKINFLOYD4.3
  • MEMBER
  • 56 POSTS
i have considered fuel delivery, but with it running rich, and getting poor fuel economy, wouldnt that mean the engine is getting plenty of fuel? what kind of fuel pressure is the CPI 4.3 supposed to have anyway? Also, are the CPI units ( aka the spider) a common area of trouble? ive been told these are prone to failure, how true is this? i dont know much about the vortec, i am more familiar with the TBI system.
i will check fuel pressure if i can get the specs and get the motor started, thanks for any more suggestions.
john
Jan 5, 2006 at 3:19 AM
Avatar
SMOKINFLOYD4.3
  • MEMBER
  • 56 POSTS
when the truck is running, it keeps a constant temp of 210 degrees, no higher, is this normal, bad, or is my gauge in accurate?
Jan 5, 2006 at 4:05 AM
Avatar
SMOKINFLOYD4.3
  • MEMBER
  • 56 POSTS
oh yeah my transfer case engages and works but the front axle doesnt pull, only when it wants to, i figure all these troubles out, ill have a perfect blazer.
Jan 5, 2006 at 7:04 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.

Discussion summary

93 chevy s10 blazer runs crappy. 4.3 vortec

A 1993 S-10 Blazer ran poorly again after reported cylinder-head repairs. The owner replaced components associated with MAP, idle-control and throttle-position codes, plus an oxygen sensor and plugs. The codes cleared but the running problem remained.

Reported outcome: No fuel-pressure measurement or successful repair was reported.

Compression was described as within specification without values. Rich running and poor economy did not identify a failed injection assembly.

Read the original discussion

AI-ASSISTED SUMMARY · REVIEWED BY 2CARPROS
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle