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  1. diesel_lv

    Another Serpentine conversion w/smog pump question

    I did the gratuitous search and only found one dealing with smog pump. Unfortunately it didn't give an ending and was from 2013. I have an '87 K5 350 tbi and want to convert to serpentine w a smog pump and use the Harrison style a/c compressor. Is there already a thread on this that I didn't...
  2. diesel_lv

    TBI injector O-ring split

    Thank you Bucket. That's what I ended up using and they just pushed down easy as pie.
  3. diesel_lv

    TBI injector O-ring split

    Yes, the little pin fits in the cutout in the pod. One faces front of engine and one faces rear of engine and when they are correct, the electrodes line up with the throttle shaft. If they are not lined up properly, the cover will not screw down. It is dummy proof. I spent 23 yrs in the Army...
  4. diesel_lv

    TBI injector O-ring split

    Hi, have a 1987 Chevy Blazer, 350 TBI. I took the TB off and rebuilt it. I used an ACDelco rebuild kit. Putting it back together the instructions say to lube the o-rings with transmission fluid and rotate the injectors back n forth until they seat in the pod. Well, I could never get them to push...
  5. diesel_lv

    1987 tbi Blazer almost stalls under load

    Im not worried about oil pressure. I was wondering if it was correct. When I hooked up a test gauge, it read 50+ cold and then went down to about 20 warm. That seems normal. But my gauge in the truck shows 15 at idle cold and about 10 hot. I had replaced the sending unit with a brand new one and...
  6. diesel_lv

    1987 tbi Blazer almost stalls under load

    Got the new ACDelco EGR valve. Installed it and works great. Got new ACDelco oil pressure 0-60 sending unit in also and it still reads about 15-20 psi. So gauge is bad. At least the test with the mechanical gauge showed it had great oil pressure. Never asked my tech about the TPS voltage, just...
  7. diesel_lv

    1987 tbi Blazer almost stalls under load

    Ok, missed a step. Didn't apply vacuum to EGR and try to start and see if vacuum dropped. Just did that and vacuum would not drop quickly. Engine would not start as too much exhaust going into intake. Troubleshooting guide says take off EGR and check for obstructions and replace if no...
  8. diesel_lv

    1987 tbi Blazer almost stalls under load

    4WDKC, Thank you for the suggestions though. Ya, I've put in 2 IAC valves. Had a Duralast in it from Autozone. A friend who is a retired GM tech said that it was bad and to put in an ACDelco one. I got one and put it in and did all the steps. It still did same thing. So now I have a spare IAC...
  9. diesel_lv

    1987 tbi Blazer almost stalls under load

    No, I didn't do a back pin to A4. I pulled a vacuum on the back side of the EGR solenoid to 15". Then turn the key to on and the vacuum stayed at 15". Telling me that the ECM is not sending constant power to the solenoid or that the wires going to the solenoid are shorting someplace. I followed...
  10. diesel_lv

    1987 tbi Blazer almost stalls under load

    Test drive, still does it with the timing advanced. Reset timing to 0 degrees. Then started reading " Exhaust gas recirculation (egr) system 1989 tbi". Never checked to see if the EGR valve had a weak spring. Never thought about it. So I disconnected the vacuum hose from the EGR valve and...
  11. diesel_lv

    1987 tbi Blazer almost stalls under load

    Bought a oil pressure tester today. From same engine port, cold was 52psi at idle, hot 20 psi at idle. So it's not the pressure. Either gauge or sending unit but I'll worry about that later. Did a little fishing around and research on the internet, uh oh, general consensus is if you don't know...
  12. diesel_lv

    1987 tbi Blazer almost stalls under load

    Pulled all vacuum lines and pulled a vacuum on them. They all held vacuum. New IAC valve. That was stated in initial post. If pintle on IAC is bottomed n butterflies are just a hair from being bottomed on the throttle body, at 700 rpm. Then there should logically be no way for idle to go lower...
  13. diesel_lv

    1987 tbi Blazer almost stalls under load

    Got SES light to work. Just wasn't seated fully in socket. Lotta work for that. Checked for codes and all it flashes is 12 so no codes. Sprayed brake parts cleaner all around throttle body to include base and shaft and no rise in rpm.
  14. diesel_lv

    1987 tbi Blazer almost stalls under load

    Checked the ground for ECM. It is good and clean at it's connection and shows strong signal at the connector. Checked SES light with a test light to 12 volts and the light did not come on with the key in the on position and the test light did not come on. Must have a short or bulb is not seated...
  15. diesel_lv

    1987 tbi Blazer almost stalls under load

    Thank you 1987 GMC Jimmy. I will check the ground for the ECM and do the test light at 12v positive to the SES light circuit after unplugging the ECM. I've gone through all the vacuum lines. If there is a leak, I have no idea. And yes, it has strong vacuum.
  16. diesel_lv

    1987 tbi Blazer almost stalls under load

    It doesn't seem to be hacked up. Broken connectors is the engine compartment but everything seems good there. How would I diagnose a bad ECM? It actually stalled tonight on test drive after replacing EGR solenoid while in the sand. Never stalled before, just idled very low. It sounds like it had...
  17. diesel_lv

    1987 tbi Blazer almost stalls under load

    Replaced EGR solenoid and still same thing. CEL does not light up when jumping a and b in port under dash. So I will have to do some troubleshooting tomorrow on that. Timing shows that at idle it is 0 degrees when warm. As I rev the engine, it advances but does not jump around. When the...
  18. diesel_lv

    1987 tbi Blazer almost stalls under load

    No, I have not tried pulling codes from it. I just pulled EGR valve and it holds vacuum just fine. But it lets carb cleaner slowly leak past the shaft. I also did a test of the EGR solenoid. It clicks when power is applied. I tried blowing through both vacuum ports. The port that leads to the...
  19. diesel_lv

    1987 tbi Blazer almost stalls under load

    Haven't checked the timing while reving it. BUT at idle it holds steady. Did not check baffling but it does it w tank full or low. Checked tps n it doesn't appear to have any dead spots. Yes, new base gasket. Have found no vacuum leaks. The CEL is intermittent. It will light up when the key is...
  20. diesel_lv

    1987 tbi Blazer almost stalls under load

    1987 blazer, 350, tbi, 700r4. New ACDelco fuel pump, fuel filter, rebuilt throttle body w new pressure regulator spring, tps, iac, engine temp sensor, hei distributor, coil, wires n plugs. All ACDelco parts. Starts fine, idles fine n drives fine. But as soon as I go off road in sand at idle n...
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