1992 S10 Blazer - Loss of Power when hitting bumps
1992 S10 Blazer - Loss of Power when hitting bumps
Hi all,
I have a 1992 S10 Blazer with 4.3L V6 engine. My issue is this - When I first start it up from a cold start, it high-idles for about 1 minute until it warms up a bit, then it idles normal. When I start driving it, it runs beautifully, full power...until I hit a bump in the road, like pavement buckled up before a bridge; or a small pothole in the road, etc. When I hit a bump, the truck just loses power, almost as if you would be turning off a fuel switch, cutting all fuel to the engine. It only lasts for maybe 2 seconds or so, and then kicks back in, running normal again. As long as the road is smooth, like on a highway, the vehicle runs like a champ, with no issues noted at all. Does anybody have any ideas what could be causing this to occur? No error codes pop up, no dash dummy lights come on, headlights stay on, etc. I have checked everything I can think of or have the mechanical capability of checking, such as loose wires to the battery, alternator, distributor cap / plug wires, fuse box, etc. I initially thought this perhaps was an electrical issue. However, the headlights / dome light stays on, dash lights, etc, so, should I be looking more towards a possible mechanical issue? I thought maybe it was perhaps a fuel pump issue? I hear the fuel pump turn on when I first turn the key on, so it definitely is pumping fuel to the motor, since it starts right up within 3 seconds of turning the key. I'm at a loss - any ideas? I greatly appreciate any help anyone can offer. ~ Steve
I have a 1992 S10 Blazer with 4.3L V6 engine. My issue is this - When I first start it up from a cold start, it high-idles for about 1 minute until it warms up a bit, then it idles normal. When I start driving it, it runs beautifully, full power...until I hit a bump in the road, like pavement buckled up before a bridge; or a small pothole in the road, etc. When I hit a bump, the truck just loses power, almost as if you would be turning off a fuel switch, cutting all fuel to the engine. It only lasts for maybe 2 seconds or so, and then kicks back in, running normal again. As long as the road is smooth, like on a highway, the vehicle runs like a champ, with no issues noted at all. Does anybody have any ideas what could be causing this to occur? No error codes pop up, no dash dummy lights come on, headlights stay on, etc. I have checked everything I can think of or have the mechanical capability of checking, such as loose wires to the battery, alternator, distributor cap / plug wires, fuse box, etc. I initially thought this perhaps was an electrical issue. However, the headlights / dome light stays on, dash lights, etc, so, should I be looking more towards a possible mechanical issue? I thought maybe it was perhaps a fuel pump issue? I hear the fuel pump turn on when I first turn the key on, so it definitely is pumping fuel to the motor, since it starts right up within 3 seconds of turning the key. I'm at a loss - any ideas? I greatly appreciate any help anyone can offer. ~ Steve
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Is this a TBI or CPI injection?
If electrical connection to the pump can be ruled out also check the bonding strap(s) to the engine and body.
In any case I would extend the search to an air ingress after the throttle body. (Vacuum leak) related to hoses or pipes.
A broken hose i.e. to the brake booster hanging but having a cut could cause such a problem related to bumps.
If electrical connection to the pump can be ruled out also check the bonding strap(s) to the engine and body.
In any case I would extend the search to an air ingress after the throttle body. (Vacuum leak) related to hoses or pipes.
A broken hose i.e. to the brake booster hanging but having a cut could cause such a problem related to bumps.
Is this a TBI or CPI injection?
If electrical connection to the pump can be ruled out also check the bonding strap(s) to the engine and body.
In any case I would extend the search to an air ingress after the throttle body. (Vacuum leak) related to hoses or pipes.
A broken hose i.e. to the brake booster hanging but having a cut could cause such a problem related to bumps.
If electrical connection to the pump can be ruled out also check the bonding strap(s) to the engine and body.
In any case I would extend the search to an air ingress after the throttle body. (Vacuum leak) related to hoses or pipes.
A broken hose i.e. to the brake booster hanging but having a cut could cause such a problem related to bumps.
UDPATE!! I noticed that the fuel pressure was at about 30 psi. So, I replaced the fuel pump, and voila! That seems to have fixed the problem! No more stalling over bumps! So, thanks to all who offered suggestions, and hopefully this thread will help those in the future with the same issue!
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